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Woburn Library Extension

Woburn, Massachusetts, USA

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

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

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 recognized that the interior spaces could no longer meet the changing demands of library visitors.

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.

The engineer specified the Hollo-Bolt, an expansion bolt that requires access to only one side of a Hollow Structural Section (HSS). 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 HSS and canopy to comply with building code regulations.

Contractors used size 5/8" hexagonal head Hollo-Bolts to connect the cantilevered canopy to the HSS 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.

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

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Faster to Install

No drilling or welding!

Independently Approved

Reasons to choose Lindapter

  • Save time and money

    Save time and money

    Clamping two steel sections together avoids time-consuming welding or conventional drilling and bolting.

  • Safer connections

    Safer connections

    Drilling and welding in the field is avoided, removing the need for hot work permits and encouraging safer site conditions.

  • High strength

    High strength

    Lindapter clamps are manufactured from high strength materials to resist high load requirements and harsh environments.

  • Industry leading approvals

    Industry leading approvals

    Lindapter has earned a reputation synonymous with safety and reliability, gaining multiple independent approvals.

  • Adjustable


    Quickly align steel sections by sliding the section into the correct position before tightening the Girder Clamp to complete the installation.

  • Free connection detailing

    Free connection detailing

    Lindapter’s experienced Engineers can detail a custom connection based on your specific requirements free of charge.

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