Here Concrete pipe including capping beam concrete grade 25 , starter bar by manufactured details , y12 150mm pipe , y12-150mm c/c Concrete pipes have been used widely for water mains. There are specifications on soil compaction, the pressure the pipes can withstand, and the composition of soils. it's important to look at the costs of the initial design, construction, materials, inspection and maintenance for the pipe. Big rocks are not a problem as long as there is uniform concrete coverage and adequate rebar for temperature fluctuations. If the big rocks protrude up above grade and if you have a few in a row, it will weaken the slab. We like things uniform, including the grade, thickness of the concrete,
