We had some book shelves fall apart and I did not just want to throw it all away. I has some spare pvc lying arournd and decided to merge the two into working bookshelves. The self on the right is just like what the old shelf looked like. The new shelf holds just as many books. One thing I knew but did not express was that these units are very portable and would be easy to break down if you had to move. Something you could not do with the original units.

Step 1: What's Needed.

What's needed:
Shelves from the old bookshelf or you can get them from the local hardware store.
4 pvc pipe lengths. s/b under 2 bucks apiece.
Pvc ends would make it look nicer but not required.
at 4 sets of screws, washers, and bolts for each shelf.

Tools:
Dril (a drill press would be better) with bits the size of the diameter of the pvc and for the screws.
Ruler
pencil.
C-Clamps (which I do not have).

Step 2: Preparation

Drill the holes in the shelves all at once so they are aligned. (something I should have done). I always did like Salvador Dali
Measure about 1/2 inc to an inch on each pipe and mark. This is where you want to drill you first holes.
Drill the four holes in the pvc for the bolts.
Put in a set of bolts, washers, and nuts for the first shelf..
Install the first shelf.
Now measure up 10 inches and repeat the process till all shelves are done.
If shelves are loose, you may want to add some king of back brace to the system.