Relief sewer main for the 19th, 20th and 23rd Districts of Budapest, Pesterzsébet, construction documentation

muszaki_adatok_cim

Technical data

Building trades

traffic engineering
utility design
electrical and mechanical design
telecommunication design
environmental engineering design
geotechnics
organisation

Principal

SADE-Magyarország Mélyépítő Kft.

Project value

2,700.00

Design value

102.55 millió Ft

Years of completion

2009 to 2012

Years of construction

2010 to 2012

A contract tender invited by the Utilities Department of the Mayor’s Office of the Metropolitan Government of Budapest as project owner was awarded to SP PESTERZSÉBET CONSORTIUM formed by SADE-Magyarország Mélyépítő Kft. and PENTA Általános Építőipari Kft. in the autumn of 2009. The construction documentation was prepared as commissioned by them. The purpose of the construction of the sewer main is to relieve the sanitary sewer main in Ferihegy and to provide a sewerage facility in the development areas of the 20th and 23rd Districts. The prime contractor consortium divided the construction works among its members as follows: SADE-Magyarország Mélyépítő Kft. constructed a nearly 2 km long sewer main section (originally with an inner diameter of Ø194 cm, then designed with an inner diameter of first Ø210 cm then Ø214 cm at the request of the Principal) from the recipient in Torontál utca along Alsóhatár út to the line of Nyír utca, using microtunneling technology at full length. They also constructed crossings across the approach of the M5 Motorway and Virág Benedek utca without excavation. Other sections of the sewer main (its sections constructed in open trenches, sewer laterals, gully and building sewers, other public sewer connections, as well as the replacement of water and gas mains) were built by PENTA Kft. At the request of the Principal, the connection to the recipient in Torontál utca was redesigned in such a way that the route did not cross the main roadway of Helsinki út and the suburban railway tracks. The microtunneling technology applied allowed forced pipe-laying in a curve. Therefore, in order to overcome minor directional changes, we took advantage of the opportunities available in this. Thus, by optimising the distance between the manholes, the number of cleaning manholes could be reduced, and large custom-made reinforced concrete structures were designed only for the beginning and the end of the section. Construction works began in March 2010. It became obvious by April that despite a valid water establishment licence, the work site could not be provided in the section of the sewer main between Lenke utca and Vezér utca by the date stated in the schedule. Therefore, an alternative route was devised along Wesselényi utca and Vágóhíd utca. Considering the fact that surveying and utility data collection had to be ordered for the new route, the designs required for the modification of the water establishment licence had to be prepared in a very short period, by the end of April. The construction of the nearly 2 km long, Ø214 cm section built with microtunneling technology was completed by the end of 2010. At present, the sections laid by PENTA in open trenches are being constructed; nearly two thirds of these sections have already been completed. In order to construct the sewer main, it was also necessary to replace several water and gas mains, and the replacement of telecommunications and public lighting poles was also necessary in some places. Total length of the sewer main: 5,275 m, of which the length of the section with a diameter of DN 220 cm (Ø214) is 1,877 m. The inner diameter of the profile is 214 cm, and its water conveyance capacity is about 5.18 m3/s. The construction documentation contained the following volumes: Sewerage construction, Replacement of water mains, Replacement of gas mains, Traffic engineering, Geotechnics, Organisation and health and safety plan, Tree-cutting plan, Replacement of T-Com network, Protection of public lighting poles and the poles of the 20 kV network, and Forest management plans required for withdrawing forest areas from production