Evaluation of the tender results of forest road constructions: A case study in Bolu Regional Directorate

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dc.contributor.authorTürk, Yılmaz
dc.contributor.authorGümüş, Selçuk
dc.date.accessioned2020-05-01T12:14:12Z
dc.date.available2020-05-01T12:14:12Z
dc.date.issued2017
dc.departmentDÜ, Orman Fakültesi, Orman Mühendisliği Bölümüen_US
dc.descriptionWOS: 000410446300008en_US
dc.description.abstractThe construction of forest roads in Turkey follows a tender process conducted by the General Directorate of Forestry. The amount of work (i.e., excavation volume) is estimated for the approximate cost schedule required for the tender. Unexpected disputes have occurred during the process of finalizing the contracts because measurements are determined by a preliminary survey done prior to preparation of a detailed project proposal. The aim of this study was to compare the road construction data that was calculated during the tender process to the exact values that were obtained as a result of construction. A total of 34 forest roads constructed by Bolu Forest Regional Directorate between 2007 and 2014 were studied. Data were obtained from the tender dossiers to evaluate and compare the cost estimated for the tenders to the actual progress values (excavation quantities, excavation features and costs) of these projects. In addition, these roads have been evaluated according to forest road technical standards. The total length of the assessed roads was 73,879 m, the total costs were USD 977,138, and a total of 726,366 m(3) was excavated during the construction of these roads. Paired sample t-tests demonstrated a statistical difference between the tender cost estimates and the progress payment amounts, and between the estimated amounts of very hard rock excavation and the actual amounts of very hard rock excavation.en_US
dc.description.sponsorshipDuzce University, Scientific Research UnitDuzce University [2012.02.02.108]en_US
dc.description.sponsorshipThis work was supported by funds provided by the Duzce University, Scientific Research Unit with the Project Number: 2012.02.02.108 Special thanks to the unit staff.en_US
dc.identifier.doi10.17099/jffiu.292012en_US
dc.identifier.endpage209en_US
dc.identifier.issn0535-8418
dc.identifier.issn1309-6257
dc.identifier.issue2en_US
dc.identifier.startpage201en_US
dc.identifier.urihttps://doi.org/10.17099/jffiu.292012
dc.identifier.urihttps://hdl.handle.net/20.500.12684/6331
dc.identifier.volume67en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakTR-Dizinen_US
dc.language.isoenen_US
dc.publisherIstanbul Univ, Fac Forestryen_US
dc.relation.ispartofJournal Of The Faculty Of Forestry-Istanbul Universityen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectForest road constructionen_US
dc.subjecttender costen_US
dc.subjectprogress paymenten_US
dc.subjectTurkeyen_US
dc.titleEvaluation of the tender results of forest road constructions: A case study in Bolu Regional Directorateen_US
dc.typeArticleen_US

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