Business

We carry out numerous works in the field of construction of hydropower plants, wind farms, biogas plants, performance of works in building construction, civil engineering, design, consulting and engineering services:

• Field survey and research, land survey, hydrography and geodetic survey activities, recovery activities, construction of facilities and structures on water, construction of facilities and structures underwater and in inaccessible areas;
• Cleaning of river beds and sediment removal;
• Construction and maintenance of sewage drains;
• Construction and maintenance of underwater pipelines and cables;
• Removal of mud from water intakes;
• Excavation of sand from rivers and lakes;

Development of electrical cabinets wiring diagrams for power generation facilities up to 400kV

• Design of relay protection and remote control cabinets
• Design of self-consumption cabinets for SN and HV plants
• Design of automation cabinets for industrial plants
• Design of NN cabinets for industrial plants

Maintenance of primary and secondary equipment in power generation facilities up to 400kV

• Maintenance of power generation facilities
• Regular annual overhaul of VN equipment at SN and HV plants
• Regular annual testing of relay protection at SN and VN plants

Design, consulting and construction supervision services

• Design of complete electrical part of medium voltage TS (power transformer station)
• Design of 110kV, 220kV and 400kV fields for reconstruction purposes.
• Design of 110kV, 220kV and 400kV relay protection action diagrams for reconstruction purposes.
• Consulting and supervision of the electrical engineering works during construction of VN plants

Other segments in civil engineering:

• Construction of facilities and civil engineering works (roads, streets, parking areas);
• Performance of mass excavations with the transport of materials;
• Performance of high-rise construction works;
• Performance of infrastructure-related works;
• Demolition and tearing down of facilities;
• Earthworks: preparation of the construction site for carrying out construction activities, which includes previous removal of the existing facilities.
  Preparation of the construction site includes: site cleaning, earthworks: excavation, backfilling, levelling of terrain, canal excavation, removal of rocks, mining, etc., drainage works on the construction site and drainage works in farming or forest land;
• General mechanical engineering works – drilling, scraping, milling, eroding, rendering, soldering, sawing, sharpening, grinding, welding, joining and other works on metal pieces;
• Transport of: construction machinery and equipment, building materials and tools, etc.

• Installation of all types of piles – driving of piles, finished and made in reinforced concrete, classic drilled and drilled CFA piles with a spiral particularly significant in the procedure of construction and foundation of wind generator piles.

The most frequently used technology is CFA piling by using an infinite drilling spiral, in the following procedure:

“OPERATING PLATFORM” TERRAIN PREPARATION

In accordance with the approved design, selected type of piles, geological-geotechnical composition of the terrain at the location where the piles are driven, the “construction plane” must be prepared before commencement of works related to piling. Due to the heaviness of the machinery required for this type of works, the construction plane must be prepared as follows:
Cleaning and arrangement of the terrain.
Terrain stabilization by backfilling and rolling.
The surface made of gravel, sand or crushed stone by great compaction (20-30Mpa) is laid on such prepared base.
The terrain should be drained in such a manner so as to allow for the evacuation of atmospheric waters.
The construction plane consists of the plane for ensuring the movement of the machinery for piling of min 6,0 m width and the plane for ensuring the movement of the mixer and automated pump 3,0 m wide.
The above specified terrain preparation ensures movement and regular operation of the engaged machinery and equipment, correct leveling, alignment and driving of piles and better operating performance.

MACHINERY AND EQUIPMENT

The installation of this type of piles requires the engagement of heavy machinery specially adjusted to this type of works, with the application of specific equipment, tools and accessories.
The machinery is transported to the construction site by truck with the additional equipment, while the assembly is performed by professionally trained staff.

DRILLING TECHNOLOGY

After preparation of the terrain and marking of piles positions, the drilling machine and equipment are installed and levelled.
The tip of the infinite drilling spiral is connected to the concrete pump. The drilling is performed by use of the infinite spiral to the designed depth.
Concrete is then placed through the middle opening of the drilling spiral, from the well opening upwards, while gradually retrieving the drilling spiral from the well.
While retrieving the drilling spiral, the excavated soil comes out and it must be removed from the well. After retrieval of the drill, reinforcement mash is accepted and lifted by the machine cable and installed in fresh concrete mass.
The pile is installed and the machine is aligned for the next position.
At the end of the working day, the system must be rinsed by pressurized water and washing compressor.
Specialized team of hydro-engineers and electrical engineers holding long-time experience.
Setup and installation of underground waterproof barriers particularly important in the procedure of construction of hydro-construction facilities.

The following work units must be mentioned: