There is a defective window in the now under construction 7- story medical rehab building in Greenfield, WI. No biggie right? Just slap a new one in.
Well, the size of the window is 8’ x 6’ and weighs in at over 500 lbs. The broken window is on the 5th floor about 65ft. Up and is partially obstructed by an overhang. The window will not fit into the building for an inside out replacement so it will have to be installed from the outside. This is how it was initially installed by a tower crane which has been disassembled and is long gone.
Does anyone have Spiderman’s number? Perhaps he could install the replacement window.
The contractor contacted Stevenson Crane who has a long reputation for coming up with clever and safe solutions when ever put to the challenge, and word had it they possessed experience with glass manipulators- a big plus from the contractor’s view.
Recognizing the growth in glass & non-porous building exteriors, Stevenson Crane recently took delivery on the Jekko MR 800.4 Hydraulic Glass Manipulator. Designed to pick up a panel weighing up to 1760 lbs. with 8 vacuum lifters, controlled via a hydraulic activation system and fitted with a dual vacuum system, this was the right tool for the job.
The glass manipulator attaches quickly & easily to 4 Jekko spider crane models fitted with matching plugs and connectors. Unfortunately the Jekko crane with the tallest reach capability of 47’7” fell 18’ short of the needed height.
Stevenson Crane’s engineers searched for a piece of equipment that would meet the lifting height requirement. With a maximum lift height of 81’ and max weight of 11,000 pounds Manitou’s MRT 2550 was more than adequate. Mantiou boasted about their RECO attachment recognition system which detects when an attachment has been properly installed, automatically applying the appropriate load chart and safe operation zones. Would the Jekko glass manipulator properly interconnect and interface with the Manitou? Tests were performed. Yes it worked!
One more hurdle, how to attach the manipulator to the MRT2550. This time Stevenson Crane’s engineers designed and built an interface fixture to fit between the MRT2550 and the glass manipulator. This fixture had to be precise as it was the base calculation for the manipulator to:
- Activate 8 vacuum lifters and raise the window to specified height
- Orientate the window to the proper position; up to 6 axes
- Place the window in the frame
- Remotely release all 8 vacuum lifters at once
The Stevenson Crane Dynamic Duo of Manitou MRT2550 and Jekko glass manipulator performed the task beautifully. In fact this is the only published article of a glass manipulator installing glass with the capability of reaching 81’.
Keep an eye out for future Stevenson Crane blogs!
Stevenson Crane, Rigging & Heavy Haul is a national leader in rigging & heavy haul, crane & aerial lift rentals, crane sales, crane service, & aerial lifts since 1989.