not-allowed-link

Black Mountain stay frame

New stay frame for antenna mast 184m above ground.

About the project

Project category

Small

Project parties

Balfour Beatty, COWI

Location

Belfast

Images

Fully triangulated frame

Side on view of stay frame

Connections and Raker clamps (bright green)

Clamp on leg of mast

Fabrication of clamp

Fabrication and construction of stay frame

Project in numbers

Installation height

184m above ground

BIM model contains

6 cast items and 150 parts

Trimble products used

Tekla Structures, Trimble Connect

Avoiding bending moments and heavier sections.

The stay landing was moved on the mast column to improve the bending moment in the mast.

On the new location, a fully triangulated frame has been used to avoid bending moments in the members which helped avoid the need for heavier sections and also to improve the ease of erection as well as improved transfer of the stay forces to the mast body. All stays on the mast are landing on stay frames because the stay lines are not aligned with the mast legs.

Overcoming work at great heights

The client's design meant we had some very bespoke pieces to fabricate. Some required a casting because of their shape and parts welded to them to make the finished product. This was due to angles of the stay frame coming onto the new clamps on the legs, which resulted in the parts needing skewed bends. Using Tekla we were able to work out the exact skewed bend required and model accordingly to create a casting for a connecting plate to fit to attach to the new frame.

The design was clamp based so we had to create numerous bespoke welded parts containing small intricate bent pieces, which if we were using 2D software would have taken us weeks to figure out. Having a 3D model helped us save time detailing and enabled us to show the fabricator 3D models of the required castings so that they could create casts to create the parts from, which ensured we were right first time on fabrication.

Using our old imperial drawings from the 1950s we were able to model the existing mast which enabled us to model the new steel precisely and run accurate clash detections to ensure nothing could go wrong during the install as it was 184m above ground. We had to be right first time with everything as down time on Antenna Masts can mean outages for 4G,5G and broadcasts. It goes without saying that working at such heights takes a lot of planning and risks!

 

Important points or benefits:

  • New frame: 184m above ground
  • Cast items: 6
  • Parts: 150
  • Bolts: 480
  • 4.7 tonnes of steel and bolts

 

UK Tekla Awards

The UK Tekla Awards honour projects that transform the way the world builds.

See all projects

The Content on this page is provided to Trimble Solutions Corporation ("Trimble") under the Tekla BIM Awards Terms and Conditions.

Trimble Logo

UK (ENGLISH)

globe wireframe
magnifying glass
Tekla logo

Productscaret icon

Tekla Structures skip iconTekla Model Sharing skip iconTekla PowerFab skip iconTekla Tedds skip iconTekla Structural Designer skip iconTekla Portal Frame Designer & Tekla Connection Designer skip iconTrimble Connect skip iconAll products skip icon

Solutions downward-facing caret

Designright caret

Constructible modeling skip iconConceptual design skip iconStructural analysis & design skip iconDesign communication skip iconConnected design skip icon

Detailright caret

Constructible detailing skip iconConstruction documentation skip icon

Fabricateright caret

Production planning & management skip iconAutomated production skip iconConnected project delivery skip icon

Constructright caret

Bid & win skip iconSite planning & coordination skip iconConnected worksite skip icon

Educateright caret

Tekla Campus skip iconTekla for students skip iconTekla for educators skip iconTekla for academic institutions skip icon

All solutions

Resourcescaret icon

Articles & blog posts skip iconResource center skip iconWebinars skip iconTekla BIM Awards skip icon

Supportcaret icon

Trimble Downloads skip iconTekla Discussion Forum skip iconTekla User Assistance skip iconTekla Warehouse skip iconTekla Developer Center skip iconTraining skip iconAll support skip icon

Aboutcaret icon

Why Tekla & Trimble skip iconContact us skip iconCareers skip iconTekla Trust Center skip iconLicense compliance skip iconAll about skip icon

| UK (ENGLISH)

globe wireframe icon

Productscaret icon

  • Tekla Structures
  • Tekla Model Sharing
  • Tekla PowerFab
  • Tekla Tedds
  • Tekla Structural Designer
  • Tekla Portal Frame Designer & Tekla Connection Designer
  • Trimble Connect
  • All products

Solutionscaret icon

Designcaret icon

  • Constructible modeling
  • Conceptual design
  • Structural analysis & design
  • Design communication
  • Connected design

Detailcaret icon

  • Constructible detailing
  • Construction documentation

Fabricatecaret icon

  • Production planning & management
  • Automated production
  • Connected project delivery

Constructcaret icon

  • Bid & win
  • Site planning & coordination
  • Connected worksite

Educatecaret icon

  • Tekla Campus
  • Tekla for students
  • Tekla for educators
  • Tekla for academic institutions
All solutions

Resourcescaret icon

  • Articles & blog posts
  • Resource center
  • Webinars
  • Tekla BIM Awards

Supportcaret icon

  • Trimble Downloads
  • Tekla Discussion Forum
  • Tekla User Assistance
  • Tekla Warehouse
  • Tekla Developer Center
  • Training
  • All support

Aboutcaret icon

  • Why Tekla & Trimble
  • Contact us
  • Careers
  • Tekla Trust Center
  • License compliance
  • All about
  1. Home
  2. Tekla BIM Awards
  3. Black Mountain stay frame
CONTACT US