On the behavior of twin buried pipelines: -- field test of large diameter flexible pipes --

摘要

Agricultural pipeline is demanded a large-scale flow area in the case of renewing an old or damaged open channel. Recently, plural large pipes are buried into the same trench in order to bury shallowly and to make maintenance easy. But the behavior of these parallel buried pipes has not been cleared enough, and these cases are designed as similar to single buried condition. This paper discusses the behavior of twin buried pipes(O 2400mm FRPM) that was obtained by in situ test during construction and one year passage. Results are summarized as follows: 1) Sheet-pile extraction remarkably increases the deflection of near side pipeline only. 2) The pipe strain of spring line restrains to 80% at adjacent side compared with sheet-pile side. 3) The strain distribution of pipe inclines to sheet-pile side and appears symmetrical phase with adjacent pipes. 4) Even so, in case of twin buried condition, the properties of pipes that increase deflection during construction and interact with backfill materials are basically similar to single pipe installation.