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A failure in the Zeesluis design gave BAM and VolkerWessels builders a headache record by the end of 2017. A study released Tuesday by the Ministry of Infrastructure and Waterways also shows that There have been many errors in the planning.
"The robustness of planning is relatively weak"; planning is "sometimes optimistic" "Catch-up possibilities are limited"; The date of availability of the lock on December 1, 2020 is "very optimistic" because the risks of delay are not taken into account; the "risks of occurrence of undesirable events are seriously underestimated"
"Nothing strange" about optimistic planning
The likelihood that the marine lock will be delivered on time is, according to the consulting firm HSProjectmanagement consulting and PmcB INFRA assignment of Rijkswaterstaat only "a few percent". According to the agencies, the date of 25 January 2022 is more realistic, 27 months later than BAM and VolkerWessels, the two largest builders in the Netherlands. The 600 million euro project will therefore have to lose an additional 61.5 million euros. The total damage on the project is now 200 million euros.
Jan Bijkerk of HSProjectmanagement was not completely surprised after the review that the delivery date of the lock was not realistic expected. "We just had to report, but we have our own image and our own experiences." According to him, there is "nothing strange about it" in the overly optimistic planning of the builders. "Because there must be pressure on the job."
Bijkerk, who was director at the North-South line, sees construction companies plans much more optimistic. "As a general rule, contractors have a 50% chance that the delivery date will be respected." The construction consortium at the sea also had this planning in the beginning, that is its impression. This is remarkable because Rijkswaterstaat assumes an 85% probability that the availability date will be reached.
Software causes problems
According to Bijkerk, the lock planners are, among other things, too optimistic about the chances of flow during dredging. The likelihood that suppliers will not comply with their agreements is also greater than both manufacturers want to estimate. "There are a lot of subcontractors and suppliers and so many interfaces and dependencies – it's often very good, but also very often wrong."
If all the parts need to be connected to each other and must function as a single entity, according to Bijkerk, there are many problems. "You have to run a lot of software, you also see a lot of problems in tunneling."
Bijkerk recommends that a "shadow" magazine be conducted every year to review planning.
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