Grand Housing Development Program Volume III - Gtz
Grand Housing Development Program Volume III - Gtz Grand Housing Development Program Volume III - Gtz
CONSTRUCTION GUIDELINE STEP BY STEP(CONTINUED)Installation of pre-cast beamsPre-cast beams and slab-hollow blocks installed28Addis AbabaCity Government
CONSTRUCTION GUIDELINE STEP BY STEP• Are enough supports for the formwork installed?• Is the bottom (footing) clean and free fromorganical material?Before starting the concrete work for the footing columns,a written approval from the resident engineermust be given.Block Work (Wall construction)Before starting with the block work all measurements(level of grade beam, floor height, columns, etc.) haveto be controlled.The height of the first layer has to be given to the masonsand marked at the columns.It is advisable to measure and mark at the columnsall other layers in order to give a guideline to the masons.The wall construction should be checked according tothe following list:• Is the mix proportion of the mortar given?• Is the mortar well mixed?• Is the strength of the hollow blocks controlled??• Are the HCB’s well stored beside the constructionarea to avoid longer transportation ways?• Is the working place for the masons prepared?• Do the masons have enough hand tools to erect astraight, upright wall?• Are the corner angels correct (90 degrees)?• Is the wall straight and upright?• Are the conduits for the electrical installationinstalled accordingly to the electrical design?Especially the U-blocks for the ringbeam must be absolutelystraight levelled because on top of the ringbeam the pre-cast beams will be laid. If there is anylevel difference, the slab will not be straight and thepre-cast beams will be bent.Slab ConstructionThe slab construction starts with the installation of theslab support. Three supports have to be installed, onein the middle of the slab and two on both sides of theslab 1 m in front of the walls. The support line shouldbe given in the structural drawings. The pre-cast beamsshould lay on a squared timber (sawn timber). Eucalyptuspoles are not the adequate material for the horizontalsupport because they are not straight enoughand hence can be bent. Every deflexion of the pre-castbeams should be avoided.Before the beams are laid on top of the support, theyshould be checked. Especially the part where theslab hollow block will be placed should be clean andstraight.The correct level of the beams should be controlledbefore the slab hollow blocks are placed.(CONTINUED)The slab HCB´s, hanging between the precast beamsare functioning like a (lost) formwork. They give only atemporary support during the installation phase. Onlythe pre-cast beams and the slab concrete (C 25) areload bearing parts of the slab. When all the HCB´s arelaid, the electrical installation can be installed. After theelectrical installation (conduits, etc.), the temperaturereinforcement will be installed accordingly to the structuraldesign. Spacers have to be installed in order tokeep the reinforcement in the right position. It shouldbe avoided, that too many people are walking on top ofthe ready installed slab before the concrete is cast.All open spaces in between the hollow blocks have tobe closed by mortar in order to avoid that the cementwater is dropping down. If this happens, the load bearingcapacity of the slab will be dramatically reduced.The concrete work should only be started after the writtenapproval of the resident engineer. He has to checkif all installations are well done and all reinforcementbars are installed accordingly to the structural design.FROM TECHNICAL MANUALS VOL I AND II CONSTRUCTION GUIDELINE STEP BY STEP29Addis AbabaCity Government
- Page 5 and 6: Prologue 3Contents 5Design basics a
- Page 7 and 8: BUILDING PARTSFull HCBThe full holl
- Page 9 and 10: BUILDING PARTS4 U-shaped HCBs joine
- 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 25 and 26: CONSTRUCTION GUIDELINE STEP BY STEP
- Page 27: 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
- Page 69 and 70: ANALYSIS OF PRECAST BEAMThe analysi
- Page 71 and 72: ANALYSIS OF BEAM AND COLUMNThe dept
- Page 73 and 74: ANALYSIS OF BEAM AND COLUMNCOLUMNSw
- Page 75 and 76: TYPICAL 3D MODELS OF RESIDENTIAL AN
- Page 77 and 78: TYPICAL 3D MODELS OF RESIDENTIAL AN
CONSTRUCTION GUIDELINE STEP BY STEP• Are enough supports for the formwork installed?• Is the bottom (footing) clean and free fromorganical material?Before starting the concrete work for the footing columns,a written approval from the resident engineermust be given.Block Work (Wall construction)Before starting with the block work all measurements(level of grade beam, floor height, columns, etc.) haveto be controlled.The height of the first layer has to be given to the masonsand marked at the columns.It is advisable to measure and mark at the columnsall other layers in order to give a guideline to the masons.The wall construction should be checked according tothe following list:• Is the mix proportion of the mortar given?• Is the mortar well mixed?• Is the strength of the hollow blocks controlled??• Are the HCB’s well stored beside the constructionarea to avoid longer transportation ways?• Is the working place for the masons prepared?• Do the masons have enough hand tools to erect astraight, upright wall?• Are the corner angels correct (90 degrees)?• Is the wall straight and upright?• Are the conduits for the electrical installationinstalled accordingly to the electrical design?Especially the U-blocks for the ringbeam must be absolutelystraight levelled because on top of the ringbeam the pre-cast beams will be laid. If there is anylevel difference, the slab will not be straight and thepre-cast beams will be bent.Slab ConstructionThe slab construction starts with the installation of theslab support. Three supports have to be installed, onein the middle of the slab and two on both sides of theslab 1 m in front of the walls. The support line shouldbe given in the structural drawings. The pre-cast beamsshould lay on a squared timber (sawn timber). Eucalyptuspoles are not the adequate material for the horizontalsupport because they are not straight enoughand hence can be bent. Every deflexion of the pre-castbeams should be avoided.Before the beams are laid on top of the support, theyshould be checked. Especially the part where theslab hollow block will be placed should be clean andstraight.The correct level of the beams should be controlledbefore the slab hollow blocks are placed.(CONTINUED)The slab HCB´s, hanging between the precast beamsare functioning like a (lost) formwork. They give only atemporary support during the installation phase. Onlythe pre-cast beams and the slab concrete (C 25) areload bearing parts of the slab. When all the HCB´s arelaid, the electrical installation can be installed. After theelectrical installation (conduits, etc.), the temperaturereinforcement will be installed accordingly to the structuraldesign. Spacers have to be installed in order tokeep the reinforcement in the right position. It shouldbe avoided, that too many people are walking on top ofthe ready installed slab before the concrete is cast.All open spaces in between the hollow blocks have tobe closed by mortar in order to avoid that the cementwater is dropping down. If this happens, the load bearingcapacity of the slab will be dramatically reduced.The concrete work should only be started after the writtenapproval of the resident engineer. He has to checkif all installations are well done and all reinforcementbars are installed accordingly to the structural design.FROM TECHNICAL MANUALS VOL I AND II CONSTRUCTION GUIDELINE STEP BY STEP29Addis AbabaCity Government