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 Technology&more

After transmitting the local coordinate system, staking 
of rising components took place using the total stations. 
The IGL surveyors marked the building axis and com-
ponents for prefabricated joists, supports and walls. In 
addition, the surveyors had the task to erect 7.655-m-long 
(25.11-ft) prefabricated supports. When the supports 
arrived on site, the team attached reflector foil targets 
to the support head before the supports were lifted for 
installation. The foils enabled accurate measurement of 
the supports as they were installed and checked.  

The final concrete of the core walls was in place by 
February 26, 2013. "We were able to beat the client’s 
deadline by two days with the use of our advanced 
surveying instruments,” Almesberger said. “Throughout 
the project we faced complex surveying tasks that 
challenged the project management team and every 
surveyor on site.” 

High Speed, High Quality
In addition to construction surveys, the IGL team per-
formed quality control surveys, or "as-builts," took place 

directly after the completion of the respective concrete 
casting sections and/or after the cores became acces-
sible. Points of interest, such as the corner points of 
the elevator shafts, were recorded using the Trimble S6 
total station. Total stations also measured floor height 
with connection to the height bolts of each respective 
floor level. 

The IGL surveying team has played a major role in 
keeping construction of the new skyscraper on sched-
ule. "The pace of construction in TaunusTurm was an 
exceptional challenge with high demands on the team 
and equipment,” says Almesberger. “The surveying 
requirements were completed with high accuracy, 
thanks to engineering expertise and the advanced 
surveying instruments. The robotic total stations ac-
celerated the surveying tasks and were able to save 
substantial surveying time and costs.” 

See feature article in Professional Surveyor's June issue: 
www.profsurv.com