Steel Fiber bilong Indastriel Floa: Slab Dip, Join na Riel Namba

Stori

Jun 15, 2013

Sapos yu putim 'steel fiber' long 'industrial floor' dispela i no inap long mekim em i no gat ol bruk. Dip bilong 'slab', 'joint spacing' na 'forklift point loads' em tripela seperet kalkulesen, na wanpela tasol bilong ol em i bilong 'fiber'.

Wanpela plua i no gat ol bruk bikos em i gat 'fiber'

Ol plua bilong ol indastri i save bruk long 5-pela as: plastik i save go liklik, taim ol i draim ol samting i save go liklik, hat i save pundaun, subgret i save pundaun na 'overload'. Steel fiber i save helpim tru namba wan tupela, helpim namba tri liklik tasol, na klostu i no mekim wanpela samting long las tupela. Taim wanpela plua i soim ol liklik bruk tripela mun bihain long ol i putim, as bilong dispela em i no gutpela 'subgrade compaction' o bikpela 'joint spacing' na i no inap 'dose'. Pasin bilong tingim ol 'fiber' olsem wanpela samting we i save pasim ol bruk em i nambawan samting we planti man i save tingim long kirapim wanpela plua we i no wok gut. Stretpela tok em olsem 'fiber' i save tanim wanpela bikpela bruk i kamap planti bruk long gras, na larim 'slab' i lusim 'shrinkage stress' wankain na i no traim long rausim bruk long rot bilong givim marasin tasol.

Ol kondisen bilong go long 200 i go long 150 mm

Wanpela plua we i no gat strong i save kisim 'flexural capacity' bilong en long 'thickness'; wantaim 'fiber', 'capacity' i kam long 'thickness' wantaim 'post-crack tensile strength'. Long tingting bilong ol, 'thinning' em i samting we i ken kamap tasol i nidim tripela samting wantaim: wanpela bikpela na wankain 'modulus' bilong 'subgrade reaction', ol hevi insait long ol 'design values', na gutpela 'load transfer' long ol join. Prektis i daunim 200 mm i go long 150 o 170 mm taim yu apim mak bilong marasin i go long 35-45 kg/m3. Eni samting we i winim 25% ridaksen i nidim ful slab sekim, i no wanpela rul bilong thumb. Wanpela poin em i isi long lusim: taim 'slab' i liklik, em i save pilim gut long 'subgrade flatness'. Wanpela 5 mm 'deviation' aninit long 3 m 'straightedge' em i no bikpela samting long 200 mm na i save kamapim ol 'voids' long 150 mm.

Joint Spacing: Bilong wanem ol 6 mita Panel i save stat oltaim

Spesing bilong ol join i save bosim 'shrinkage stress'. Ol i save putim simen nating insait long 6 mita panel; wantaim 'steel fiber' dispela inap long gro i go inap 8 o 10 mita bikos 'fiber' i save apim bikpela 'tensile strain'. Taim ol i mekim ol panel i kamap bikpela, i gat wanpela samting ol i mas mekim pastaim: dip bilong 'saw-cut' i mas kamap long wanpela hap bilong 'slab thickness', na katim i mas kamap bihain long simen i kisim inap strong tasol pastaim long ol 'shrinkage cracks' i kamap, planti taim 12 i go inap 24 aua bihain long bikpela kapsait. Katim leit na 'slab' i bruk pinis long hap em i laikim, olsem na 'saw cut' i no mekim wanpela samting. Narapela samting we ol i no tingim em 'dowel spacing': mekim ol panel i kamap bikpela na holim ol 'dowel' long 300 mm na ol join bai bagarap.

20-40 kg/m3 Em i wok mak bilong ol plua

Ol plua na simen bilong haus i save yusim 'dose' long narapela narapela rot. Simen bilong wokim haus i no inap long benk na bagarap long 30 i go inap 80 kg/m3; ol plua i save sakim 'shrinkage' na 'point loads', we 20 i go inap 40 kg/m3 i save helpim pinis pasin bilong bruk na ol hevi-diuti plua i save go inap long 45. Antap long 50 kg/m3 pinisim i save kamap hat moa na 'surface fiber exposure' i save go antap. Dispela mak i wankain olsem 0.25% i go inap 0.5% long volium, we em i wankain namba sapos ol i raitim long tupela rot. Oltaim stretim as bilong en insait long kwotesen, sapos nogat em i luk olsem em i no gat bikpela pe long volium fraksen na em i dia moa long kilogram bilong wankain samting.

Fletnes na 'Surface Fiber' Eksposesen

'Floor acceptance' i karamapim 'flatness', planti taim FF/FL o 3 m stret, na tu, kwaliti bilong 'surface'. Bikpela 'dose', bikpela 'slump' na 'late finishing' olgeta i save subim ol 'fiber' i go antap na kamapim ol 'whisker'. Rot bilong stretim em i no liklik 'fiber' tasol tripela kontrol: holim 'slump' long 140 i go inap 180 mm, kirapim pawa long flot hariap bihain long 'vibration', na 'dry-shake' wanpela 'hardener' we i gat nid. Ol 'fiber' we i stap ples klia pinis ol i ken grisim bek, tasol moa long 3 mm bilong grindim i rausim hap bilong 'wear layer'. Long ol 'automated warehouse' we i nidim bikpela 'flatness', holim 'dose' long o aninit long 30 kg/m3 na laikim 0.55 mm gutpela 'fiber'.

Ol 'Foklift' na 'Racking Loads': Ol 'Point Load' i bosim

Lod we ol i no tingim tumas long wanpela indastriel plua em 'forklift'. Wanpela 3 t trak wantaim ful lod i save salim i go long foapela wil, olsem na wanpela wil tasol inap long karim 4 i go inap 6 t antap long sampela ten skwea sentimita. Lokal bending bilong dispela poin lod i save winim ifek bilong yunifom lod. 'Racking' em i moa strong: foapela 'uprights' long wan wan 'bay', na olgeta wan wan i gat moa long 10 t. Olsem na ol i mas sekim 'reinforcement' na 'dose' wantaim 'point load' we i nogut tru, na i no 'average service load'. Long dispela as, wanpela 'automated warehouse floor' i kost moa long 30% antap long wanpela 'conventional flet store' bilong wankain eria.

Ol join we 'steel fiber' i no inap long senisim

Planti taim ol i no kliagut long ol samting insait long indastriel plua em long tingim 'steel fiber' olsem as bilong noken katim ol 'saw cuts'. Faiba i save apim 'post-crack capacity' na strong bilong en, em i save mekim ol 'crack' i kamap gutpela, strongpela na isi isi long op, tasol em i no save stopim simen long go liklik, olsem na olgeta join we ol i nidim i mas katim yet. Nomal praktis em long katim so long 'column grid' long spes bilong 6 mita, long dip bilong wanpela kwata bilong 'slab thickness'; sapos i no dip tumas dispela i no save kamapim bruk na sapos i go daun tumas dispela i save daunim strong bilong hap. Ol 'isolation joints' i stap klostu long ol 'column', ol kona bilong wol na ol 'equipment bases', we ol 'restraint' i stap na i no gat 'fiber dosage' inap long kompensetim. Wanpela samting ol i save lusim tingting long en: ol i mas rausim 'slab' long ol wol ausait na ol 'ground beam', sapos nogat, 'wall' i pasim 'slab', na 'cut pattern' i senis olgeta na bruk i kamap namel long rot bilong kar. Dry-shake hardener i nidim instraksen bilong em yet. Ol i save brodkastim agreget pastaim long namba wan setim long 3 i go long 5 kg/m2; eli tumas na em i go daun, leit tumas na em bai no inap pas. Forklift point load em i wanpela seperet dimensen. Ol 'fiber' i save helpim 'punching capacity', tasol 'slab thickness' aninit long 'concentrated wheel loads' i no inap long baim bek wantaim 'dose'; 150 mm em i klostu pinis long mak bilong wanpela trak we i gat 5-pela ton, na olgeta samting we i liklik moa i nidim lokal 'thickening' o wanpela 'steel plate'. Ol plua i save kamap gut o bagarap long 'joint layout', 'sub-base flatness' na namba wan 7-pela de bilong 'curing' moa yet long 'dose' we i stap long beg.

Faivpela samting we wanpela 'floor inquiry' i mas tokaut long en

Wanpela steel fiber inkwairi bilong wanpela plua i kisim wankain kwot taim em i tokaut long faivpela samting: slab tiknes na panel sais, disain lod (yunifom na maksimum poin lod), sabgred taip na modulus bilong sabgred riaksen, dos o volium fraksen, na standet we ol i mas inapim. Ol projek bilong salim ol samting i go aut i mas kisim nem ASTM A820 o EN 14889-1. Samting we planti taim i no stap em 'modulus' bilong 'subgrade reaction', na em i samting we i save makim sapos 'slab' inap long kamap liklik. Long sekim ol 'real project dose' rekomendesen na 'packaging', 'industrial flooring' seksen bilong 'steel fiber product' pes i listim ol 'recommended dose' na sais bilong ol 'package' we i save senis i go stret long ol kontena kwantiti.