Lifting an old steel truss bridge

[chiggy]

My customer has an old 65ft steel truss bridge that he wants to use to cross a small creek. It's very similar to this one:

http://www.bgstructuralengineering.com/HmwrkDwg/TBridge/bridge15.gif

except on mine the floor beams sit on top of the cross beams. The bridge is already sitting on the site and is in generally good condition, just needs to be put into place. I have never done any lifting details and was wondering if someone here could point me in the right direction, and perhaps give a few tips.

 

[bridgebuster]

Attached is an article from The february issue of Modern Steel Construction concerning large picks. There are other ways to put the bridge in place; one is launching; that's a common method for installing Bailey bridges.

 

[amec2004]

Use 4 points or 8 points mobile crane lift.

We have done quite a lot module lifting, much heavier than this one, not a big deal.

anchor bolt design per ACI 318-11 crane beam design

http://www.civilbay.com

 

[dhengr]

Chiggy:
I think you should talk with some local riggers who might help you with the lift. A good share of what you might do will depend on the lifting equipment they have available. Alternatively, what you can do given the strength and weight of the bridge might dictate that some methods or equipment would not work.

What does the bridge weigh and how wide is it. Obviously, you will have to do some analysis of the existing structure to see what will work. You might lift from above or along side of joints A, but you must keep the bearing points clear so you can set the bridge down on the abutment bearing points. You would probably have to design some removable lifting fixtures to do this. Lifting at four points, with cross beams, under outer joints B or joints C, might be easier to design and from the rigging equipment standpoint. You might have a crane at one abutment, with sufficient reach and cap’y., and slide the entire truss across the creek to that crane position. The sliding end might be done on rails and rollers, and can be lifted and positioned a little with a front end loader, or smaller crane without the reach, or some such.

 

[DadBreza]

Chiggy,
Egyptians have managed to build the PYRAMIDES thousands of years ago without knowing the wheel.

You use your common sence and when determining your method of approach take time and look on the task from every angle possible not to get into some-kind safety trouble.....

You may have good equipment around so not big deal - two hour job....

In case you are in the bush conditions you migh sped some time on it and you will manage.

For more advise I would require the site layout, bridge overall mass and dimension, bridge new position foundation plans, equipment and skills of man-power available.
DadBreza