Grand Housing Development Program Volume III - Gtz

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BUILDING PARTS(CONTINUED)Column HCBThe column HCB has a size ofL=32 cm x W=16 cm x H=19 cm.It is used as a formwork for columnsand at the same time as apart of the wall.Column HCB viewed form topSlab HCBThis slab construction system, introducedby the Low-cost <strong>Housing</strong>Project, avoids formwork, reducesrequirements of skilled manpowerand time. The system has twomajor components: the pre-castbeam and the slab HCB.The production of the slab HCB isdone in the same way as productionof wall HCB.The slab HCB viewed from top / sideColumns made out ofcolumn-HCBsAfter constructing the column outof column HCB’s, one side of theColumn HCB with reinforcementHCB at the bottom of the columnhas to be opened to remove themortar that has fallen down duringwalling up. This has to be done toensure a reliable connection betweenthe cast-in concrete and theslab foundation.After walling up, the column is castwith concrete.Connection in between column andwallColumn HCB with reinforcement8Addis AbabaCity Government
BUILDING PARTS4 U-shaped HCBs joined together as alintel with reinforcementSection of HCB with typical placementof reinforcementThe pre-cast beam (bottom) and thereinforcement itself (above)Detail of the reinforcementLintels and Ringbeamsmade out of U-shapedHCBsAfter the wall is properly erectedthe U-shaped HCB’s are placedin at the height of the ringbeam;the reinforcement bars and theconcrete will be placed within theU-shape HCB according to thestructural design.Lintels will be prefabricated on aflat ground area in the same wayas the ringbeams.Precast BeamsIn the pre-cast beam production,the reinforcement has to beproperly bent. Especially for thestirrups, the diameter for bendinghas to be 4 times greater than thediameter of the stirrup itself.The stirrups must be welded at thetop with the main reinforcement.The pre-cast beam is then castby using a mould and a vibrationtable so that the concrete is wellcompacted. The beam production(CONTINUED)This technique avoids extra materialfor formwork.The use of wooden formwork hasnegative effects on the environment.Moreover it requires skilledmanpower and time to mantle anddismantle the form work.The concrete used for filling has tomeet or exceed C25.and transport to the place where itis going to be cured can be doneby four people.After having finished the productionof the components, five labourerscan do the proper layingof the pre-cast elements and slabHCB in one day.Considering 40 sqm of slab, thetemperature reinforcement, theelectric and sanitary lines and alsothe formwork around the slab canbe done within 2 days.One can start the construction ofthe walls on the slab three days aftercasting of the concrete.With the usual method one has towait 21 days without dismantlingthe formwork hampering the activitythat could be done above orbelow the slab.FROM TECHNICAL MANUALS VOL I AND II DESIGN BASICS AND DIMENSIONS9Addis AbabaCity Government
Page 5 and 6: Prologue 3Contents 5Design basics a
Page 7: BUILDING PARTSFull HCBThe full holl
Page 11 and 12: SCHEMATIC CONSTRUCTION PROCESS5 6Re
Page 13 and 14: SCHEMATIC CONSTRUCTION PROCESS13 14
Page 15 and 16: MORTAR AND MASONRY WORK CONSIDERATI
Page 17 and 18: VIBRATING TABLEDrawings of the vibr
Page 19 and 20: CLAMPS FOR HOLDING PARTS OF FORMWOR
Page 21 and 22: THE MANHOLEBottom-view (left) and t
Page 23 and 24: CONSTRUCTION GUIDELINE STEP BY STEP
Page 31 and 32: BASICS ON ECOLOGICAL SANITATION- Op
Page 33 and 34: FUNCTIONAL DESCRIPTION OF A DRY TOI
Page 35 and 36: ECOSAN PILOT PROJECT (PPP)The priva
Page 37 and 38: 8189 126Sections wash basin22fae
Page 39 and 40: DETAIL DRAWINGS FOR SANITARY INSTAL
Page 41 and 42: SANITARY INSTALLATIONTo ensure corr
Page 43 and 44: WALL CONSTRUCTIONExisting exterior
Page 45 and 46: FIRST FLOOR SLAB REPAIRA lintel is
Page 47 and 48: CONCRETE BEAM REPAIRInserting the n
Page 49 and 50: ROOF COVERINGRoofing shingle made o
Page 51 and 52: INTERNAL STAIRCASEThe handrail befo
Page 53 and 54: PLASTER WORKApplying fist coat (spl
Page 55 and 56: FIRST FLOOR TERRACES WEATHERPROOFIN
Page 57 and 58: FLOORING WITH CEMENT OXIDE SCREEDCa
Page 59 and 60:
LAYING THE PARQUETFor some rooms,fo
Page 61 and 62:
TILING WORKTiles can be cut with an
Page 63 and 64:
SUSPENDED CEILINGSLathing for the s
Page 65 and 66:
RENEWAL OF DOORS & WINDOWSChecking
Page 67 and 68:
PAVING WORKKeep similar sizesof rab
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ANALYSIS OF PRECAST BEAMThe analysi
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ANALYSIS OF BEAM AND COLUMNThe dept
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ANALYSIS OF BEAM AND COLUMNCOLUMNSw
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TYPICAL 3D MODELS OF RESIDENTIAL AN
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TYPICAL 3D MODELS OF RESIDENTIAL AN
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STRUCTURAL DESIGN OF COST EFFICIENT
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Page 85 and 86:
Page 87:
CREDITS TO THE STAKEHOLDERSTsedale
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Grand Housing Development Program Volume III - Gtz

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