Project consisted of the installation of 6,100 linear feet of gravity sewer
line in downtown Houston. Microtunneling was used to drill 1,821 linear feet
of 30" I.D. pipe and 3,379 linear feet of 24" I.D. pipe. This 6.6" pipe was
manufactured by Mission Clay Pipe. Beneath two railroad spurs, 210 linear feet
of 8-foot pipe (36" I.D.) was installed using microtunneling technology.
There were 20 separate drives on the project the longest being 415 linear feet
and the shortest 156 linear feet. There were 10 drive pits and 10 receiver shafts.
The depths ranged from 43 v.f. to 29 v.f
The soil conditions ranged from layered sandstone, to hard clay, to very fine
wet sand. The depth of the tunnel below ground water averaged 15’. The line and
grade deviations were 1.5" vertical and 6" horizontal.
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