sectional work barge design

[expedition]

We need some help to design for 2 sectional barges, something like you see at http://www.bargesystems.com/pictures.htm

Each section would be 40 ft. long and 8 ft. wide. The 2 sections would be united by a bridge, making the platform as wide as possible but at least 3 ft. wider. Ideally, the sections would be united by removable beams that get inserted in each section and then locked into place. To make it even more rigid, 3 overhead frames would be placed at very end and center of the barges (say 19 wide, 10 ft. high) that would also serve as a light roof support (we're in Panama: either it rains or the sun is shining like crazy).

Ideally, those frames simply have to be put into existing 'holes' with a very simple locking device. A

The load capacity of the total platform doesn't have to be more than about 30.000 lbs. It will only be used on inland waters. A support structure for an outboard is also required.

Part of the section would house a diesel tank (2x 250 gal. or so); one a fresh water tank (also 2x 250 gal.); we'll need area a little bit reinforced to accommodate a 25 KW genset....

And maybe a very simple ramp on the side

What would be best: steel or alum? I understand alum. doesn't corrode but you need more of it to give the same strengh and a few sacrificial anodes on a steel construction should help too.

The design would have to include the files so a CNC machine can cut all the required pieces and they only have to weld things together here in Panama.

Thorwald

[vishnubaiju]

How will you move the barge?
I am a Naval architect and can provide the design of a barge 40 ft x 8ft size.
Steel is the best material. You provide anodes and paint well, it will last 20 years and more.....
Also give me the email ID

[Ad Hoc]

It depends what is available locally for repairs. This will probably dictate more than any other 'technical' requirement. I suspect steel is common throughout your part of the world?

But for that size, transportability is a big factor...ie weight!

[expedition]

My idea was to add a structure at the rear of each barge to attach an outboard engine.

Steel is most common here and practical, probably cheaper too but yes, weight is an issue.