CAPURRO FISHING TERMINAL, ENVIRONMENTAL USE OF DREDGE SLUDGE PIANC AMERICAS 2023
Creators: name: Zorrilla, Jose
name: Zeballos, Marcelo
name: Gerbaudo, Carlos
Publisher: name: Zenodo
Year: 2023
Subjects: Sludge Treatment, Dredging, Geobags, Sensitive Clays, Construction Procedure of marine geobags with sediments.

description: ABSTRACT<br> The Capurro Fishing Terminal Project in Montevideo, Uruguay, is considered one of the most important<br> ports in the South Atlantic for deep-sea fishing. With a length of 1,700 meters of transitory, operation and<br> maintenance berths, it is the largest expansion carried out in the Port of Montevideo by the National Ports<br> Administration (ANP).<br> The port project is sectored into a set of works, materialized by two structural typologies, the so-called<br> retroarea area made up of “Cofferdam” type metal sheet pile cells, filled with selected material, mechanically<br> compacted and subsequently improved in compactness by vibrocompaction. Above this component there is a<br> reinforced concrete superstructure located at the upper level made up of slabs with buttresses, edge and<br> perimeter beams, which make up the loading and unloading area called L1, 192 m long and L2, 118 m long.<br> The retro-area sector and a large part of the port's operation area present a lithological composition in which a<br> superficial deposit of clayey silt soils can be seen, with a high level of deformability and with diverse organic<br> matter contents. Below this layer, several meters thick, appear the local rock formations, in which<br> metamorphic lithologies predominate. As highlighted in this work, the soft surface material constitutes an<br> element of complexity, both for the materialization of the port structure, and for achieving the adequate draft in<br> the area of operation.<br> Following the retroarea is the outer dock, made up of transversal reinforced concrete porticos, made up of<br> large-diameter piles, an upper lintel beam and a semi-prefabricated ribbed slab that constitutes the dock<br> platform. This component includes the 202 m long loading and unloading sector L3, the 70 m long berthing<br> corner sector L4 and the 394 m long berthing sector L5. The transitions and joints between the main<br> structures and the defense system against the impact of boats and mooring bollards complete the structure of<br> the pier.<br> As part of the project tasks, in order to allow its operation, it has been necessary to dredge the roadstead,<br> and part of the soft soils located in the retro-area sector, made up of sensitive and slightly contaminated clays<br> from the Bay of Montevideo. The reuse of the material obtained from dredging was conceived, anticipating its<br> ionic treatment and subsequent deposition. In order to put this dredging sludge to beneficial use, its use as<br> landfill for application in the coastal zone of the bay was established. In this case, the solution consisted of<br> treating the flow from the dredge with polymers and confining it in woven polypropylene tubes.<br> The geobag deposition environment comprises two areas of 50,000 m2 and 64,000 m2. The first of them<br> destined to the conformation of a tourist park, while the second constitutes an area rescued for the execution<br> of tasks of collection and movement of cargo typical of the port. The particular treatment of these areas prior<br> to the disposal of the geobags requires the formation of embankments to limit the work sectors, and analysis<br> of the potential effects of consolidation and failure due to excess pressure in the contact between the geobags<br> and soft soils. local. As part of the conditioning of the site, localized compaction tasks, arrangement of<br> draining floors and application of auscultation systems were carried out to verify compliance with the<br> calculation hypotheses initially formulated in the soil-geobag interaction.<br> From the location of the dredger in areas defined by the composition of the clay, and in order to adjust to<br> a minimum the dosages in the plant for environmental and cost reasons, the distribution was carried out by<br> lines, continuously monitoring the concentration of solids before and after the treatment, the control of<br> monomers at the outlet, and the control of the filling of large geobags, changing tubes in filling stages. The<br> Port of Montevideo is qualified as Environmentally friendly.<br> In this technical work the main characteristics of the Project are described, where the authors advanced in<br> different stages in Innovation, Conceptual Engineering, Detail Engineering and control of results; to make this<br> work 50% environmental and 90% innovative, for example in wave protection through permeable walls, and<br> care for the shoals of fry that make this low coast the breeding area for high-altitude fish species.<br>