bridge repair

[jnapier]

Hello,
I have read the posts on one member asking for help to replace the wood on his bridge. I need to repair my bridge and have other questions, I hope that someone can help me. OK here are some of my questions, but first my situation.
First let me explain what kinda bridge I have. It is a bridge that goes over a stream (40 feet long). It has earthen abutments on each end. Has two concrete pillars in the middle (12 feet high, 4 feet thick), and steel beams across the pillars with oak 4x6 decking. No railings.
I need to repair one of the concrete pillars, it is starting to wash away on the bottom from the action of the water when it floods. Right now it is only about 6 inches up from the base (the concrete is flaking away) and about 6 feet long. My thoughts were to drill into the concrete and put rebar into the drill holes, connect the rebar together to make a frame, I would also drill into the bedrock and place rebar into the rock, then construct a wood frame and pour concrete to make a base over the existing pillar. Has anyone done this before? Does anyone have any assistance they could help me with. I do not want to repair this poorly, but I cannot remove the bridge while I repair either.
[img]/forums/images/icons/frown.gif[/img]

[egon]

I'd strongly suggest an opinion or plan from a Civil Engineering licensed for your area who can do an on site investigation.

I realize this is really no answer but there are many unknowns involved.

Egon [img]/forums/images/icons/grin.gif[/img]

[jnapier]

Thanks Egon,
That sounds expensive. Do you know of a source to contact civil engineers in sw va. Please let me know if you do.

[egon]

I live a long ways from there.

Egon

[GaryM]

You might check with a local college and see if they know of anyone.

[egon]

Could you post more pictures of the area involved. This may give a little better understanding of your problem. What is the present used for?

Egon [img]/forums/images/icons/grin.gif[/img]

[LazyJ_Arabians]

I think the proper fix would be to get a new footing around and partially under the existing column with rebar extended into the additional column area to be created. I'd rethink drilling rebar into the existing support and approach the project more like putting a cast on a broken leg.