University of Twente Student Theses


Een onderzoek naar de oorzaken van ‘verzoeken tot wijziging’ voortkomende uit de contracteringswijze D&C Light en mogelijke maatregelen voor Prorail

Nijkamp, O.D. (2015) Een onderzoek naar de oorzaken van ‘verzoeken tot wijziging’ voortkomende uit de contracteringswijze D&C Light en mogelijke maatregelen voor Prorail.

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Abstract:Recent years showed that the used D&C Light contracting method of ProRail, for railway underpass projects, resulted in many 'requests for modification’ (VTW’s) and related Project Management, Engineering, Administration and Supervision (PEAT) costs. In addition to that was the duration of these D&C Light projects frequently larger than planned. ProRail wanted a thorough research with the numbers and the cost of the submitted VTW's. Four D&C Light projects in the Netherlands have been selected and analysed: Almelo, Deventer, Boskoop en Nootdorp. In particular the underlying causes of the submitted VTW's is investigated. Thereby ProRail can optimize the design process and construction of such projects. Measures have been developed in this research against the causes of the VTW's derived from the D&C Light contracts. The purpose of these measures is to reduce the VTW’s in the D&C Light projects, which are legitimate and include financial value. Based on this goal it is examined in which categories the VTW’s must be qualified. The literature and the pre-research reached out three categories that are relevant and useful for the classification of VTW's causes. The allocation of the VTW's by these three categories is more workable and consistent than the so far used models by ProRail. The three categories that are used in this research are presented below: A) Errors in the design process; B) Additional requirements of stakeholders; C) Insufficient information of the underground. After the allocating of the VTW’s in the three categories the quantitative VTW comparison were analyzed. The main conclusions from the quantitative VTW comparison are these:  The difference between the total VTW value in relation to the project Boskoop (10%) and de project Nootdorp (36%) is considerable;  Over the total of the four D&C Light projects, it shows that category C (insufficient information of the underground) has the highest percentage total VTW value compared to the procurement budget (12%) as well as the highest percentage of the average VTW value compared to the procurement budget (0.35%). In all D&C Light projects key stakeholders submitted VTW’s after awarding the D&C Light contract. In particular the municipality of Almelo, which meant simply to submit VTW’s because they as financing party determined what was being built. In the project Nootdorp the second client Rijkswaterstaat requested a far-reaching VTW. In general, there seem to be many stakeholders in this kind of infrastructure project which have direct and indirect influence. In particular, the local governments regular effect on various aspects the requirements in the project, which are mainly focused on the integration of the project in the environment. This is strongly driven by the political interests in the municipality.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering and Management MSc (60026)
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