Teixeira Duarte – Engenharia e Construções, S.A., through the area of Geotechnics and Rehabilitation | Maritime Works, concluded, for the Lisbon Tourism Association, the contract of Reinforcement of the Foundations and Structures for the Platform (anti-seismic safety) between the cruise terminal and Terreiro do Paço in Lisbon, an intervention that is part of a group of several rehabilitation and requalification works of the riverside front of the capital and that covered two projects with a total duration of 150 days:
- Platform and West Wall
This project aims to reformulate the riverfront on the western edge of the South and Southeast Pier, restoring the original limit, drawn with reference to the wall of dating and the western facade of the tower to the east of the Praça do Comércio (current tower of Finance).
The intervention consisted of the execution of the piles that constitute the foundation of the future platform and west wall.
The platform and western wall will occupy a total area of about 900 m2, with development of 90.00 m and a maximum width of 15.40 m.
The intervention area had, in a great part of its area, a landfill with rockfill protection, as a result of the execution of the station and the western tunnel of the metro. This embankment allowed the execution of 40 piles with the use of hydraulic equipment to drill the rotation with a kelly rod and provisional coating of the hole through recoverable intubation. In the southwest corner, there was a small stretch of the original pier, built in the middle of the 20th century. Within the scope of this project, and given its apparent poor state of conservation, it was necessary to carry out its complete demolition and, using appropriate means, it was possible to execute the remaining 20 piles in a marine environment using definitive metallic tube crimping through vibrofonceur and excavation with mechanical grab.
- South Reinforcement, to be integrated into the South and Southwest Pier
As part of the rehabilitation of the riverfront, this project aims to reformulate the area of influence between the South and Southwest River Station of Architect Cottinelli Telmo and the existing wharf, whose construction of the embankment dates back to the first half of the 20th century.
The reinforcement executed aims to contribute to the minimization of the impacts associated with liquefaction and/or cyclic mobility phenomena in the alluvium in case of seismic action, consisting of the execution of piles headed by a reinforced concrete slab. In the service phase, the platform will be used for pedestrian circulation in that area.
The southern platform will occupy a total area of about 1,220 m2, with development of 95.00 m and a maximum width of 15.80 m.
The type of reinforcement solution adopted is identical to the one already applied in the area to the east of the South and Southeast River Terminal, i.e. the area of Transtejo station. This solution consisted of the execution of pile alignment by fully crossing the alluvium and penetrating the Miocene substrate to mobilize the maximum cutting effort in each pile. In general, the reinforcement consists of 4 parallel alignments to the river of 1.20 m diameter piles away from 5.0 m. The distance between alignments is 3.0 m. The piles are arranged in quincunx to maximize the arc effect on the ground and thus maximize the associated reinforcement effect. The methodology applied to the execution of the 74 piles made on the existing embankment was the use of rotation drilling equipment with a kelly rod and provisional coating of the hole through recoverable intubation.
