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Rehabilitation and extension of sewerage network and adjacent water supply network of City of Shumen – Stage 2

Subject: Design, rehabilitation, and extension of sewerage network and adjacent water supply network of City of Shumen – Stage 2 and design and construction of two new sewerage pumping stations
Assignor: Shumen Municipality
Contractor: Consortium „Aqua Build Shumen”, Leading Member „Stanilov” LTD

2014 - 2015

The contract for the project’s execution was concluded on 22.04.2014 pursuant to the FIDIC contractual provisions for electrical and mechanical works and for construction and engineering sites, designed by the Contractor (Yellow Book), amended and supplemented by Specific Conditions in observation of the requirements of the Territorial Structure Act and the sub-statutory normative deeds. The project’s financing was provided under Operational Program „Environment 2007-2013“.
Principal work types:
 Design and construction of 59 sections of the sewerage network (including 2 nos. pusher units from Sewerage Pumping Station /SPS/ 1 and SPS 2) with total length of 31 966 m. Constructed 469 nos. revision shafts, 5 nos. rainwater overflows with overflow channels, building diversions and 665 rainwater intake shafts. The sewerage was executed with glass ceramic pipes for diameters Ø 300, 400, 500 mm; polypropylene pipes (PP) SN8 for diameters Ø 630, 700, 800, 900 mm; Glass Reinforced Pipes (GRP) SN10000 for diameters Ø 1000, 1200, and 1400 mm
 Design and construction of 12 nos. sections of the water supply network with total length of 8 563 m. The water supply network construction was executed via the use of PEHD pipes and fittings with diameters DN90, DN 110, DN 160, DN 350, DN 450, DN 630, and the building water supply diversions via the use of PEHD pipes from 32 mm to 63 mm
 Design and construction of two sewerage pumping stations:
- Pumping station № 1 - outfitted with three nos. submersible pumps, with pusher unit РЕ 140 (PEHD) with length of 1735 m
- Pumping station № 2 - outfitted with three nos. submersible pumps, with pusher unit РЕ 225 (PEHD) with length of 1650 m
Specific passages:
 One no. passage through water obstacle type „bridge-channel”.
- For crossing of „tailrace” of micro-dam Teke dere on the territory of City of Shumen constructed „Bridge-channel” facility. Bridging was executed in casing of steel pipes, resting on concrete foundations. The sewerage pipe was executed of polyethylene pipes – high density (PEHD).

 Two crossings over the railway line:
- Crossing of railway line Sofia – Varna at km 439+670 executed by drilling with pipes ф560, HDPE, in steel casing pipe with diameter ф820/12mm;
- Crossing of wartime railway line Dibich – Matnitsa at km 4+765. The crossing was executed by drilling, in steel casing pipe Ø 219 mm.

 Two crossings under the road:
- Crossing under municipal road SHU1180 (Sofiisko shose)  with pipes PE, DN315, PN6, laid in horizontal borehole in steel casing pipe with diameter Ø 630/11mm
- Crossing under the road „Shumen – Veliki Preslav“ executed without excavation with pipes PE, DN315, PN6, laid in horizontal borehole in steel casing pipe with diameter Ø 630/11mm.