Congress Square
Boston
最好的项目ect and Project of the Year Finalist

所有者：相关的比尔
Lead Design Firm:箭头
总承包商和建筑经理：Consigli Construction Co.
土木工程师：Nitsch Engineering Inc.
Structural Engineer:McNamera / Salvia Inc.
岩土工程：海莉·奥尔德里奇（Haley Aldrich）
支撑和支撑：Thornton Tomasetti
MEP代码：Cosentini
Historic Preservation:Tremont保护服务

Working with limited info from original drawings and having limited access for field verification were ongoing challenges for this complex project that transformed five interconnected historic buildings into a modern urban campus.

一位法官说：“该项目在现有建筑物中面临着独特的挑战。”

The more than 343,000-sq-ft structure, delivered on time and within budget in 32 months, comprised major renovations and additions to three of the five buildings—repurposing them into one new commercial office building with a seven-story vertical glass addition constructed on top of what is now 33 Congress. Crews built the new superstructure on 14 steel transfer columns, which connect to the concrete core and 2,000 tons of structural steel framing around the core.

In building the addition, the team says it juggled partially dismantling three separate yet interconnected buildings with different geometries and grid lines while deciding which structure to preserve. The team shored the original building facades and structure from roof down to three levels below the street where crews installed mini-pile foundations to support the new central elevator core and seven-story addition.

“They saved a piece of history, at least a facade, and kept the vibe of that entire historic area and built a new building inside it … visually it’s a very nice project,” said another judge.

拆除开始后，团队发现现有建筑物铆接钢的碳含量太高，无法接受焊接钢连接。该团队对所有现有钢进行了详细的激光扫描，以使制造商可以使用机械固定而不是焊接来设计新的钢铁，以正确连接到现有的钢上。通过在记录工程师的扫描数据上使用新的钢连接的3D模型，该团队能够简化钢铁承包商的现场修改。

After demolition was completed at the core, the steel fabricator laser scanned all existing beams. For each connection of new steel to old, a custom-engineered bolted connection was necessary, the team says. Assuring the steel was fabricated to a custom fit required close collaboration with the design team.

Many unexpected conditions were revealed during structural dismantling and demolition, requiring the team to work together to find solutions. When the team found the steel layout and framing differed from what was found on the historic drawings, they had to continuously verify all historic structures that would remain and make adjustments to the field conditions. This required verifying all steel locations within each building and at the existing roof parapet to ensure steel would be properly located and accomplish the design intent. The team incorporated this info into 3D building information models.

To support the vertical addition, the team constructed a modern concrete core to consolidate the existing building’s many elevators. As separate buildings were connected, they threaded the core through an existing light well at the center of the building.

The team constructed a 1,700-sq-ft, seven-elevator core mat foundation and 14 perimeter pile caps in the basement to prepare for the addition. It also threaded 14 supercolumns down through the existing buildings to support the vertical addition. Crews were often left with only 8 ft to 12 ft of headroom from the drill rig, which required “significant adaptations” by the pile-driving team, the team says.

为混凝土垫板和核心墙腾出空间也很具有挑战性。该小组说，从建筑物的顶部到地下室清除了80英尺乘80英尺的开口，这需要800辆卡车的材料才能拖出。

To preserve historic features of the original building, the team restored existing brass grillwork in the lobby, repaired and restored existing patinated copper cornice at the top of the existing building and installed new copper flashing and a patina green thermoplastic polyolefin (TPO) membrane to upgrade the parapet construction to today’s weatherproofing standards while preserving the cornice’s historic character.

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