本文发表在 rolia.net 枫下论坛HPB is more like a trade name than a specified material. There is no standard provincially and municipally now for it (Brampton may have in the old day. they still use it now?).
I guess the name is from its use at water main bedding. You need to place HPB before you lay the water main pipe at the trench base. It is my understanding that the pipe can be fairly better supported curvedly on the HPB instead of theoretically and linearly supported by the soil base. I had only one project of watermain. I saw the practice.
In addition to above, two of our small projects are stone pavements on a structural concrete deck of underground parking garages (Condominiums drive circle). Installation sequence upwardly is structural concrete slab - geomembrance - protection board - HPB - geotextile (270R) - bedding sand - stone pavers. The catchbasins collect all surface run off and all water in the HPB. The purposes of the HPB here are 1) free drainage of water; 2) to aviod any compaction effort on the structural decks.
In a house or building constructions for either subfloor or perimeter drainages, Perforated pipe was covered IN ALL SIDE with 20 MM CLEAR STONE (NOT HPB - You can but waste of money) and WRAPPED WITH GEOTEXTILE 270R.
I have never seen people use it for road base myself.更多精彩文章及讨论,请光临枫下论坛 rolia.net
I guess the name is from its use at water main bedding. You need to place HPB before you lay the water main pipe at the trench base. It is my understanding that the pipe can be fairly better supported curvedly on the HPB instead of theoretically and linearly supported by the soil base. I had only one project of watermain. I saw the practice.
In addition to above, two of our small projects are stone pavements on a structural concrete deck of underground parking garages (Condominiums drive circle). Installation sequence upwardly is structural concrete slab - geomembrance - protection board - HPB - geotextile (270R) - bedding sand - stone pavers. The catchbasins collect all surface run off and all water in the HPB. The purposes of the HPB here are 1) free drainage of water; 2) to aviod any compaction effort on the structural decks.
In a house or building constructions for either subfloor or perimeter drainages, Perforated pipe was covered IN ALL SIDE with 20 MM CLEAR STONE (NOT HPB - You can but waste of money) and WRAPPED WITH GEOTEXTILE 270R.
I have never seen people use it for road base myself.更多精彩文章及讨论,请光临枫下论坛 rolia.net