Tok i go pas
Hevi bilong bruk bilong wanpela ain waia rop em i wanpela bikpela samting tru insait long 'rigging engineering'. Sapos yu kliagut long hau long skelim stret dispela bai mekim wok bilong apim samting i stap gut na bihainim ol standet bilong indastri olsem ISO 2408 na EN 12385.
Breking Lod em i wanem samting?
'Breaking load', ol i save kolim tu olsem 'minimum breaking force' (MBF), em i mak bilong strong we wanpela waia rop inap long karim pastaim long em i bagarap. Em i save kamap long 'kilonewtons' (kN) o 'tonnes' (t).
Ol bikpela samting we i save mekim 'breaking load'
- Strong bilong Waia:Planti taim em i save stat long 1570 N/mm2 i go inap 2160 N/mm2.
- Rop Konstraksen:Namba bilong ol 'strand', ol waia long wan wan 'strand', na kain 'core' i save mekim strong bilong brukim.
- Fill Factor:Reshio bilong metalik kros-seksen eria i go long eria bilong rop we i stap klostu.
- Spinning Loss Factor:Em i as bilong strong bilong ol waia i go daun bikos long 'helical winding' bilong ol waia.
Fomula bilong brukim lod
Ol i ken skelim 'theoretical breaking load' F olsem:
F = K × d² × R₀ / 1000
We:
- F= Minimum breaking load (kN)
- K= Empirical factor dipen long rop konstraksen (planti taim 0.3–0.55)
- d= Nominal rop diamita (mm)
- R₀= Strong bilong ol waia (N/mm2)
Praktikel Eksampel
Long wanpela 20mm diamita 6×36WS-IWRC ain waia rop wantaim 1960 N/mm2 gret:
F=0.40 × 202 × 1960 / 1000=313.6 kN (inap olsem 32 tan)
Ol samting bilong sefti
Oltaim yusim wanpela sefti fakta (planti taim 5:1 long jenerel lifting, inap 10:1 long pesonel lifting) taim yu makim wok lod limit (WLL).
Konklusen
Stretpela 'breaking load' kalkulesen em i bikpela samting long seif 'rigging practices'. Oltaim lukluk long ol spesifikasen bilong ol kampani na ol standet taim yu laik painimaut hamas rop inap long stap.
