Grand Housing Development Program Volume III - Gtz

BUILDING PARTSFull HCBThe full hollow block has a size ofL=32 cm x W=16 cm x H=19 cm.This size of the HCB is reducedin comparison to the usual sizesused in Ethiopia. The new size ofthe hollow block reduces the productionmaterial and makes theFull hollow block viewed from top HCB easier to handle, this reduceslabour and material costs.During the wall construction thehollow block is placed up with theclosed bottom facing upwards.Therefore the loss of mortar duringconstruction is reduced and thebond between HCBs is increased.Full hollow block viewed from bottomHalf hollow block viewed from top (left) and bottom (right)U-shaped HCB viewed from top (left) and from bottom (right)One mason can build 170 pcs ofHCB per day on an average.After wall construction, it has to bewatered for at least 7 days.Half HCBThe half hollow block has a size ofL=16 cm x W=16 cm x H=19 cmand represents exactly half of onefull HCB.Usage is similar to the full HCB.U-Shaped HCBThe U-shaped HCB has the samesize as the full HCB; L=32 cm xW=16 cm x H=19 cm. It is usedas a formwork for ringbeams & lintelsand at the same time as a partof the wall.FROM TECHNICAL MANUALS VOL I AND II DESIGN BASICS AND DIMENSIONS7Addis AbabaCity Government