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116 Bathurst Street is located one block from Sydney in Hyde Park, Australia, making the apse and arches part of the city. The 37-story tower, also known as the Castle, will house retail and residential space, as well as a hotel. The design competition for 116 Bathurst began in 2013 and after four years of construction, the building was completed this month.
The castle consists of a 10-story podium adjacent to the historic Porter House, from which a tower extends and dominates the Porter House. Porter House, a 142-year-old heritage-listed building, provided inspiration for the design of the castle. The two buildings are connected by a monolithic concrete bridge with an open passage at the bottom. This allows guests to move between the reception and common areas at Porter House and rooms on the new podium. The retail store on the ground floor separates the two entrances and is accessible from the next street. The top five floors of the tower are set back in line with the city’s sun access height plan near Hyde Park and contain stepped gardens.
The facades of the podiums are made with curved edge bands of monolithic concrete slabs on the southern and eastern sides of the building. The window system is installed between the slats and consists of aluminum panels and glass. The north and east facing façades adjacent to Porter House contain part of the building’s exposed concrete core and a uniform curtain wall constructed from fiber cement-filled panel sections. The façade adjacent to Porter House is equipped with bridges and its façade has steel framed glazing. Angelo Candalepas, director of Angelo Candalepas Associates, said the podium’s scale was designed to fit its urban context, “anchoring the building with a single and simple expression that prioritizes corners.”
The façade of the residential tower is constructed from arched and flat precast concrete elements, while the apse and podium arch continue on the tower’s street façade, albeit in slightly different proportions. Aluminum window frames frame glazing containing up to eight double-glazed windows on the north, south and east sides of the tower. The west-facing façade features “load-bearing precast concrete and block façades with fixed glazing and casement windows and louvres for natural ventilation in public areas.” As Candalepas told AN, “The chosen materials and form of the building were inspired by the surrounding historic buildings and context.” . Candalepas said fiberglass-reinforced concrete was considered during the design process, but cast-in-place concrete is best for durability, maintenance and Sydney’s climate.
Candalepas noted that while concrete was the obvious choice, it proved to be a “difficult” construction process, as errors in the pouring process could not be masked. Formwork deflection resulted in more deflection than expected, making it difficult to install prefabricated window modules on site. However, the resulting unity of the facade corresponds to the building.
Angelo Candalepas and Associates worked with Surface Design façade engineer and subcontractor G. James to review shop drawings early in the design process, prior to building documentation. The design team worked with a general contractor who built a full-scale prototype facade for strength testing.
The design team considered a number of environmental factors for the façade, which Candalepas says contributes to “efficient use of resources.” They emphasize the light color of the concrete and panels, and also protect the glass by enhancing the passive penetration of the sun’s rays. All windows are double glazed and the living rooms face north to “minimize unwanted western sunlight”. The overall design and orientation of the façade maximizes daylight, which limits the running costs of electricity for heating and artificial lighting. Tiered gardens also take into account environmental considerations by planting native species that absorb storm runoff and reduce heat gain from the roof.
The design of the castle does not add environmental factors to the building one by one, but is consistent across its entire surface. While the apse pattern elevates the tower above the podium, perforated aluminum panels surround the tower’s east-facing façade, giving the residence a more modern feel.
Post time: Oct-22-2022