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Case Studies

Woburn Library

Sectors: Architectural
Applications: Cantilevered entrance canopy

Summary: Lindapter Hollo-Bolts provided a solution for securing a cantilevered entrance canopy.

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Woburn, Massachusetts, USA
Product: Hollo-Bolt® by Lindapter®
Architect: Childs Bertman Tseckares
Engineer: Thornton Tomasetti, Boston

Project Background

Woburn Public Library was built in 1879 and is a significant landmark within the City of Woburn with listed status on the National Register of Historic Places. In recent years the exterior envelope and roof had deteriorated resulting in water ingress, furthermore it was recognised that the interior spaces could no longer meet the changing demands of library visitors.

Client Requirement

A feasibility study for renovating the historic library and extending it with a modern wing was conducted. There were two phases to the project, first the restoration of and renovations to the existing building and secondly the construction of a new three level steel framed extension to the rear of the building. It was on the entrance to the new extension that the engineer identified a need for a method of connecting a steel cantilevered canopy.

Design Solution

The engineer specified the Hollo-Bolt, an expansion bolt that requires access to only one side of a Structural Hollow Section (SHS). Hollo-Bolt was chosen as it offered significant benefits including, fast installation, high strength capacity, and a wide range of independent technical accreditations, which include the CE Mark, TÜV and ICC-ES Seismic approvals. The connection design also incorporated a 1/2” thick non-compressible thermal break between the SHS and canopy to comply with building code regulations.

Contractors used size M20 hexagonal head Hollo-Bolts to connect the cantilevered canopy to the SHS of the entrance. Installation was quick and easy as each bolt is simply inserted into predrilled holes and tightened with a torque wrench to the recommended tightening torque to provide the necessary clamping force.

The design of the steel framed extension along with the specification of Hollo-Bolts provided sufficient moment strength to hold the cantilevered canopy. The result is a covered entrance with no column interference and a clean, modern appearance.

"We specified Lindapter Hollo-Bolts to support the cantilevered canopy due to the product’s versatility and independently approved loading capacities. We are pleased with the result and intend to highlight the canopy and it’s detailing in our project portfolio." Senior Associate, Thornton Tomasetti

Hollo-Bolt Benefits

- Fast, cost saving installation from one side
- For square, rectangular and circular hollow sections
- High resistance to shear and tension
- Unique high clamping force design

Click here to download the Hollo-Bolt datasheet.

Watch our installation video below.