FasterCuse - hope this helps answer your question
Finally got some information about what I was calling the "hoops" that support the fabric from the gentleman below, the Engineer of Record at Geiger and how they are attached to the cable truss and when he expects the roof to be ready to go up and the "fabric arches" to be visible - just got his answer around 7:30 P.M.
Dear Bill,
We received your email and hope we can answer your questions. As the Engineer of Record for the new roof Project, I am flattered at your interest in the project.
As for your question, the steel tube arches that support the tensioned membrane (ptfe-coated fiberglass fabric) are referred to as the “fabric arches”. I am afraid there is no established technical name for these elements and like many components in a project like this, their name develops in the course of the project rather organically by the construction team. In this case, the name is appropriate.
The fabric arches are supported by the cable truss which is in turn supported by the new steel crown truss and the original concrete ring beam. The fabric arches are attached to the cable truss by the way of steel fabrications that bolt to the cable intersection clamps. The typical arch attachment is made via a machined ball & socket so as to “pin” the arch to the cable truss. You should be able to see these being attached on the web cam after the cable truss is pulled into place and jacked, which will be occurring over the next 4 to 5 weeks.
I hope this answered your questions. We appreciate your interest in the Project.
Thank you and Best Regards,
David M. Campbell P.E.
Geiger Engineers
2 Executive Blvd. Suite 309
Suffern, NY 10901
t 845. 368.3330 x 111
m 845. 729.1063
dmc@geigerengineers.com
The fabric arches as you can see in the Geiger renderings below I believe support the fabric for the roof. However they also have another function which is to help keep the snow from accumulating on the roof. I may be wrong here but I remember that being discussed.
I am trying to find the pages that showed the ends of the arches being heated and also the ball and socket which pin the arch to the cable truss which tomcat mentioned has to be done carefully as the arches are
very large. There was also a page that showed the pins. If I can find it I'll post it as it shows the pieces clearly and how the end of the arch fits over the ball and socket attached to the cable truss.