The steam tunnel is a 7'x6' rectangle section. The run is about 80'. Yes, it not a pipe - it's a tunnel.
It sounds like flowable fill is the way to go. Will the vents be similar to those used in rainwater harvesting tanks - i.e. goosnecks?
Thanks @LittleInch. Yes the existing steamlines are quite large. I assume designing the bulkheads properly means taking into account the force of the flowable fill during construction.
I had a question about how to abandon steam lines. The size of the steam line is approximate 7' X 6'. Does abandoning a steam line require installation of bulkheads on open ends and does the line need to be filled with flowable fill? Do the bulkheads need to be engineered structurally to...
