| Summary: | 碩士 === 國立交通大學 === 工學院碩士在職專班工程技術與管理組 === 96 === Due to the varieties and complexities of dredging environment on domestic marine
construction projects, the duration is frequently beyond control. Those uncertainties existing
in marine construction lead to the necessity that when estimating duration, the workable days
have to be ensured. However, the impact arising from duration often varies with the dredging
environment and choice of dredging equipments, which easily results in the contractors’
misjudgments on the overall project such as the machinery breakdown, damage and
suspending for repairs which in turn impact the operation of follow-up construction.
In light of the above, this study, focusing on dredging operation of marine construction project,
is to analyze and assess the liable factors affecting project duration through looking back
relevant papers, practical case study of past dredging projects and interviews with
professionals having more than 20 years in the said fields, which in turn may work out the
countermeasures. The purpose is to provide the contractors with references for project
execution, which would let project managers, according to the project nature and dredging
conditions, estimate the workable days and preclude the possible factors delaying duration
which in turn may complete the project smoothly and on schedule.
As per the study, in terms of dredging area, marine dredging engineering is to be classified
into in-harbor and offshore operation. Comparing between them, project duration is to be
largely impacted by the latter than the former,The factors affecting project duration, in terms
of extent of impact and probability, can be categorized into four major elements inclusive of
weather and sea state, deposit in dredging area, condition of the dredger and discharge
pipeline, which can further be divided into eight sub-elements including typhoon, monsoon,
cohesive soil, underwater obstruction, over-time operation, and damage, drifting-away and
sinking of discharge pipeline.
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