Yılmaz TÜRK, Selçuk GÜMÜŞ

Orman yol inşaatı ihale sonuçlarının değerlendirilmesi: Bolu Bölge Müdürlüğü örneği

Orman yollarının inşası, Orman Genel Müdürlüğü tarafından ihale yoluyla gerçekleştirilmektedir. İhale için gerekli olan yaklaşık maliyet cetvelindeki iş miktarı, yol aplikasyonu sırasında yapılan 1. gözlemsel ölçümlere göre belirlenir. Detaylı proje hazırlanmadan, ön araştırma ölçümleriyle sözleşmelerin tamamlanma sürecinde beklenmeyen anlaşmazlıklar meydana gelmektedir. Bu çalışmanın amacı, ihaleye çıkılırken hesaplanan yol inşa verileri ile inşaat sonucunda çıkan kesin değerlerin karşılaştırılmasıdır. 2007-2014 yılları arasında Bolu Orman Bölge Müdürlüğü (BOBM) tarafından yapılan toplam 34 orman yolu örneklenerek incelenmiştir. Bu projelerin ihale yaklaşık maliyet ve hakediş değerlerini (kazı miktarını, kazı özelliklerini ve maliyetleri) karşılaştırmak için ihale dosyalarından veriler elde edilmiş ve değerlendirilmiştir. Ayrıca, bu yollar orman yolu teknik standartlarına göre değerlendirilmiştir. Araştırma sonuçlarına göre; yolların toplam uzunluğu 73.879 m ve toplam maliyeti 977.138 $ olup bu yolların inşası için toplam 726.366 m3 kazı yapılmıştır. Yapılan bağımlı iki örnek t-testi sonucunda; ihale toplam tutarı ile hakediş toplam tutarı arasındaki fark ve hakediş çok sert kaya kazı miktarı ile yaklaşık maliyet çok sert kaya kazı miktarı arasındaki fark istatistiksel olarak anlamlı bulunmuştur

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

The 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 m3 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.

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