Removal of Transfer Girder

[mgardina]

I have two transfer girders that I must remove that support a single concentrated load of 1,000K. I have developed two schemes but I am having difficulty developing a method on how to preload my new structure to minimize deflection as load is transfered over. With such high loads and being on the third floor of a high rise, is there equipment available/speciality contractors that can actually perform the work?

Does anyone know of a speciality contractor with this type of equipment?

 

[dicksewerrat]

Call a few heavy machinery movers in your area.

 

[Ingenuity]

mgardina,

I think hydraulics are the best way to handle your situation. Provide temporary support (tower/braced framing + steel beams) immediately adjacent to the existing transfer girders (those that will be removed) such that the existing 1,000 kips load can be transferred to this temporary support system. By using calibrated hyd jacks (underneath the temp beams/on top of the tower framing) and a hyd manifold with pump, it is possible to de-load the transfer beams, reinstall new permanent support, then de-load the temporary supports, hence loading the new permanent support. This can happen in a very controlled way, with measurements of load and displacement. It is somehwat specialised, but it was been done before.

I would contact a CONCRETE POST-TENSIONING company in your area. They are involved with hydrailucs and often do "heavy lifting" and specialized jacking, including syncronized jacking and preloading.

HTH