Construction restarts at Miami’s deepest parking lot

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Dive brief:

  • Work resumed at Miami-based developer OKO Group Una Residences, a 47-story, 135-unit residential tower in the Brickell section of Miami, after shutting down in November. By order of the city’s construction officials, construction was halted last month due to groundwater violations and complaints from nearby residents, according to local Miami TV station WPLG.
  • After conducting a site review, the Miami Building Department and a team of three independent engineers “concluded that the water intrusion that took place earlier this year did not cause any impact to surrounding structures and that the Una construction can now continue, ”the project said. entrepreneur, William J. Real, founder and CEO of Civic Construction Co., said in prepared remarks for Construction Dive.
  • The building, which the developer says will have Miami’s largest underground garage, is located just yards from the Biscayne Bay waterfront. Residents of neighboring Brickell townhouses have spoken to WPLG of their concerns about the construction causing soil erosion, cracks in the concrete and displacement of the soil.

Dive overview:

Miami-based developer OKO Group has ambitious plans for the 236-car, 100,000-square-foot parking lot at Una Residences, which is buried three stories underground and is designed to serve as a waterproof foundation for the structure.

The construction team uses cutting edge technology, design and engineering to build the garage. The project, which began earlier this year, required workers to drill 800 holes 50 feet deep into the ground and fill them with concrete and water. The interlocking pillars created a cement block that is hollowed out to build the garage, according to OKO Group.

In an email to Construction Dive, Quentin Suckling, structural engineer at Australia-based Sheer Force Engineering, said building basements is one of the highest-risk items in the construction industry, because there are more unknowns.

“When constructing a deep basement adjacent to an existing building with shallow foundations, some movement of the existing building may be unavoidable, especially if the neighboring building is close enough to the proposed new basement,” said Suckling said.

If things go wrong, it can lead to significant structural damage to neighboring buildings. If the basement is not waterproof enough, this can also cause problems.

“If not rectified, excessive leaks can have an adverse effect on neighboring buildings, as it can lead to lowering of the water table and collapse of neighboring foundations,” Suckling said.

Building close to a shore can also lead to a host of problems if not done right, as it can be below the water table and be in a saltwater environment, he said. .

“If the basement is not detailed enough to protect key structural elements from the corrosive effects of the saltwater environment, degradation of the basement walls can occur,” Suckling said. “This can cause the wall to fail prematurely, which can have serious consequences for nearby neighboring buildings. “

In its statement to Construction Dive, Real said the company “will continue to work with the City of Miami and its team of independent consultants to ensure the safe progress of construction.”

Concerns about surfing persist

The Champlain Towers South condominium collapse in Surfside, Fla., Which left 98 people dead on June 24, has led to increased scrutiny of how construction is affecting neighboring properties, according to Jonathan Kurry, partner based in Miami at global law firm Reed Smith.

“I think there is definitely a lot more attention on things that could cause harm. [next door], especially in light of Surfside, ”he told Construction Dive.

At Surfside, a class action The November 10 update alleges that the towers were “severely damaged and destabilized” as a result of excavations and construction at the nearby 18-story condominium, Eighty Seven Park, according to court documents.

The lawsuit, filed in Miami-Dade Circuit Court on behalf of the victims of the collapse and their families, alleges that 8701 Collins Development ignored warnings about vibrations and other issues from residents of Champlain Towers South.

Law firm Greenberg Traurig, attorneys for Eighty Seven Park developer Terra Group, responded to Construction Dive with a backgrounder claiming that the Eighty Seven Park construction team did not cause any structural damage to CTS and that “neither their work nor their equipment was capable of damaging the reinforced concrete which failed.

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