|
|
Solutions From Concept To Completion
Structural Engineering
Site Solutions From Concept To Completion
Civil Engineering
Solutions Where Land Meets Water
Marine + Coastal
Solutions From Procurement To Completion
Construction Engineering
Structural + Mechanical Specialists
Entertainment Engineering
Consultation, Design + Inspection
Facade + Building Envelope
Soil + Foundation
Geotechnical Engineering
Investigation + Litigation Support
Forensic Engineering
Arts + Entertainment
Live Performances
Museums + Art Displays
Pop-Ups
Signage
Studios + Sound Stages
TV + Film Production
Theaters
Theme Parks + Playplaces
discover
Education
Colleges + Universities
Private + Specialty Schools
Public K-12
discover
Energy
Solar Energy
Transmission Infrastructure
Wind Energy
Oil + Gas
discover
Government
Municipal
State
Federal
discover
Healthcare
Senior Care
Hospitals
Outpatient Facilities
discover
Industrial
Heavy Industrial
Warehouse + Distribution Centers
Industrial Ports + Terminals
discover
Ports + Coastal
Berths, Piers + Wharves
Bulkheads
Esplanades
Ferry Landings, Ship Terminals
Floating Structures
Ports + Terminals
Marinas + Breakwaters
Transfer Stations
discover
Public Infrastructure
Bikeways + Trails
Garage + Parking Facilities
Parks + Public Spaces
Recreational Spaces
Streetscapes
Utility Infrastructure
Water + Wastewater
discover
Real Estate Development
Commercial
Community Facilities
Mixed-Use
Multifamily Residential
discover
Transportation
Airports
Bridges
Ports + Terminals
Rail Transportation
Roads + Highways
Ropeway + Linear Infrastructure
discover
Floating Harbor Wetland
Multimodal Processing Plant
416 + 420 Kent Dynamic Highrise
Wittpenn Bridge
Tiffany Crane
LaGuardia Airport Terminal B
NYC Ferry
Orlando Airport LED Displays
A leading full-service engineering firm renowned for our trusted, high quality, and innovative approach to solving complex challenges.
Monopole Tower Plumbness Survey - McLaren Engineering Group

Monopole Tower
Plumbness Survey

Tall steel monopole towers sometimes appear to lean, putting into question their stability and plumbness. Yet, at different times of day, the same poles may appear vertically straight. Is this a cause for concern?

The best way to determine monopole plumbness is a detailed survey check of the base flange and anchor rods. What may be happening to the steel tower itself could be the effects of thermal expansion, commonly referred to as “sun camber” or “sunflower effect”.

Steel has a thermal expansion coefficient of 6.5×10-6 per inch per degree Fahrenheit. As such, throughout the day, ranging temperatures and effects of shade and direct sunlight can cause steel to grow or shrink due to its elasticity. Leaning or curving of steel monopole structures is more noticeable because the tower will not only grow in height but also the portions exposed to direct sunlight will grow at a different rate than the shaded side. This can temporarily cause an uneven appearance.

Recently, our Survey + Scanning team performed topographic survey of a newly installed transmission line of monopole towers to determine their plumbness top to bottom, as well as the straightness within each segment.

Using a Leica ScanStation P50 long range 3D laser scanner, with a scanning accuracy of 3mm and up to 1 kilometer in range, the team was able to measure plumb deviations from each towers’ centerline.

Although, two of the towers appeared to exceed the plumb tolerance, the survey helped determine that solar camber and wind effects were at play, but the towers were within plumb tolerance.

Monopole Tower Plumbness Survey - McLaren Engineering Group