Split / Divide linestring into parts / segments ?

I am having this kind of problem that I have one linestring("door") and then I am searching how many linestrings has intersect the linestring("door").

I am getting the intersections thats not a problem. What I need is to split / divide this "door" linestring to segments or parts or what ever...

So my goal is to devide "door" into 30 different parts (like if door is 30meters then I need thirty 1meter pieces). Then I can calculate how many linestrings are intersecting door

and in what part of door.

                                linestring "door"

<----1------><-----2-----><------3------><-------5-----><-----6-------> and so on ...

Hope you guys undestood my need and somebody can help me little bit !

Thanks mates

Br.

Grant