Wordpress Theme

Plumbing the structure

After the first intermediate or interior frames have been set, Rhino recommends that all purlins, girts, and eave struts be installed in the braced bay and the entire bay plumbed, aligned and braced before proceeding further. If the building is designed with cable bracing, the erector is resposible for providing temporary erection bracing.

When this bay is properly and accurately plumbed and braced, the remaining members, to large degree, will automatically plumb and align when installed. Only a final check of the building plumb remains and few adjustments if, will be necessary.

Plumb the frame with a plumb bob or transit, not a spirit level. To measure lateral plumbness hang plumb bob from top of the column down the outsided flange. Adjust plumbing cables to obtain equal tape measurements at top of column.

To plumb the braced bay lengthwise using a transit, sight in the transit parallel to the base of the frame columns by using a position a few inches from the frame line. Make sure transit is level. Check frame by reading tape through transit. First bring colunmns into plumb, then rafters, by adjusting diagonal bracing. Take all measurements from centerline of flange. Take a measurement at the base of the columns and adjust the bracing to correct the transit reading at the rafter measuring location. Once the frame is plumb, all connection bolts and anchor bolts would be tightened.