Acrow Props: Njikwa Mbata, Mmetụta Obobo

Mmegbuozi Na-acha N'ụtọ Nke Ndị Acrow

Imechi ihe karịrị maka ndị Acrow si na-eche echiche na-agbanwe agbanwe na nchekwa mmegbuozi n'ime ụlọ mmepụta. A 2023 survey by the Forum Nke Mmetụta Nke Oge Kpatara amalitela projeke ndị na-eji iwu mgbochi akwado si pụtara ọdịda ndị acrow site na 41% ma na-ejikọtakarị ya na ihe omume ahụike.

Akụkọ Izu-asaa maka Ime Acrow Props N'ụtọ Na N'ụtọ

1. Wepu ebe ọrụ nke debris ma zere na mpaghara enweghị obere dị ka ọnụ
2. Nchịkọta akwụkwọ nkeji ịnye ike na agwa ọsọ ọsọ n'ime gburugburu ebe obibi
3. Gbanye tube telescopic na within 150 mm nke ogologo ahuhu
4. Kwalite akwụkwọ nkeji nwere ike spirit level ịhazi maka ntuziaka pefect vertical
5. Tinye nzaghachi ikpeazụ n'akụkụ mekanism threaded pin maka ntọala kachasị mkpaara nke njikọ

Kwalite Akwụkwọ Nkeji na Nchịkọta maka Nzukwo Mmụọ

Akwụkwọ nkeji dị kwesịrị ịbara mgbe niile 3x diameter prop, ebe akwụkwọ nkeji steli 8 mm enyere aka ịgba mbọ na mpaghara. Maka mpaghara ghara arọ, jiri screw jacks nyere aka n'okpuru akwụkwọ nkeji iji wepụta slopes ruo 5°.

Nnukwu Ọkara: Kedu Ebe Ndị Acrow Prop Ga-Ejikọta per Metre Iji Nyere Mmetụta Kachasị Mma

Ebe Mbute (kN/m²)	Nnukwu Ọkara nke Props (mm)	Ogologo Plate (mm)
10–20	900–1200	5–6
20–35	600–900	8–10
35–50	450–600	12+

Mee ka ị laghachi akara nnukwu mgbe ị na-eji isiokwu mbute nke onye ọrụ maka prop model gị.

Ndị Pro Tip maka Ntugwui Oge Na-Amalite Na Nzukọ On-Site

• Wepụta akara props site na mbute ogologo site na iji spray paint bands
• Mee ka ị kpolitere ya na mpaghara staging mgbe oge ahụ dịkwu
• Jiri ihe ngagosi lasa kewaa akwụkwọ nchịkọta na mpuru osimiri elu
• Gbanwee ndị ọrụ n'ime 90 minit nkebi iji chebe nkwenye mgbe ọ na-arụ ọrụ ahụ dị otu

Akụnta 2023 maka Ntuziaka Mmelite Na-ezighị ezi nke Temporary Works Forum kwuru na ndị ọrụ bụla dabere na ụzọ a rụọ ọrụ propụ nwere ike ịdị mma karịa otu iri na ise na abụọ ọnwa na anaghị ekwe omume.

Ntughari Nka Na Ihe Ngosipụta Ihe Mgbakwansi Gbasara Iji Chọpụta

Kedu ka usoro teleskopik mere ka acrow props nwere ike ịbawanye obere

Ndị njikwa telescopics na-arụ ọrụ site n'iji tubulu stili pịa ya n'ime ya, na usoro mkpuchi pin dị mma, nke mere ka ọ bụrụ ezie ka redio ike dị otú ahụ n'ime millimeters iri asaa. Njikọ kachasị nwere ike ire ngagharị akwụkwọ gburugburu n'etiti meter 1.8 ruo mgbe ọ dị na 4.3 meter ọ bụla ma ọ bụrụ na enweghị ihe ọzọ a ga-enyekwa ya. Mgbe onye ọrụ anaghị achọ ịdị ndụ, ha na-egbu egbu isi tubulu na-agbachi ya site n'iji pin ndị na-agba n'elu. Nke pụtara na oke mma bụ na oke mma nke ohere niile dị mma, ebe ọ bụ na ọ dịkarị na akwụkwọ dịghị irè. Ndị omenala karịrị nwere plate ndị nke na-ewere otú omume dị ka plus ma ọ bụ minus digri iri ise, nke na-atụnyere maka nzaghachi nkele nkele nke ndị mmadụ.

Ịhọrọ ukwuu acrow prop dị ka e chọrọ site n'akụkọ ahụ

Ihe atọ dị mkpa na-amalite ukwuu:

• Span Pụrụ iche : Gbanwee obosara ịgbachara na ngagharị akwụkwọ n'etiti usoro ndị na-akwado (tinye millimeters 100 ma ọ bụ 150 maka ntaramahụhụ redio)
• Ara Arịrịọ : Ndị ọrụụka (1.8–3m) na-akpaghị aka n'ime 20–35kN; ndị dị elu (3–4.3m) na-akpaghị aka n'ime 12–20kN
• Mmetụta Ebe : Họrọ akụkụ ojii na-eme n'ime obi ike maka ebe na-adịghị mma ma ọ bụ akụkụ ojii dị mfe maka ebe na-adị mma

Ịdoro ike nke ịdị n'aka na obere ma ọ bụ ukwuu obosara

Obosara tube na-egosi ike nke ike—tube nke 48mm na-enye ike karịa 35% dibenside na model 42mm n'obi oga dị ka otu. Maka mmemme zuru oke:

• Jiri props 1.8–2.4m na diameter 48mm maka formwork concrete (>25kN/m²)
• Gbanwee props 3–4m na tubes 42mm maka nkwarụlị ngwaọrụ mbata (<15kN/m²)
• Enwere ike ịgbanwee tabulụ ike onye ọrụ, site na ịdị ntakịrị ike 8–12% maka 0.5m n'obi oga nke ọma

Ihe a na-enye ohere maka ihe otu isi prop na-enye aka n'ime ihe karịa 300mm concrete ma ọ bụ njikwa beam timber n'ime njikwa ọrụ.

Ike Nkwado na Mmemme Ọrụ Nke Acrow Props

Ịmụta Akara Nchịkọta Acrow: Ebe Ndịdaaka Dị na Tabeli Mbipụta

Ndịdaaka acrow na-agba ume na tabeli mbipụta ndakọsịrị maka ịdeterminedike mkpuchi ike. Dịka ọmụma, ndịdaaka 2m nwere ike inwe ike mbipụta kwa 20 kN gbasaa BS 4074, ọ bụ ezie na ike ahụ na-ebere site 30% na 3m dabere na ngosipụta nke ukwuu. Tabeli a na-egosi ihe ndekọ dị egwu:

Oke Ndịdaaka	Ike Mbipụta Kacha (kN)	Ife Mmetụta Ojii
1.5m	25	3:1
2.0m	20	2.5:1
3.0m	14	2:1

Mee ka ị laghachite ma ọ bụrụ na ọ dị mkpa mgbe ị na-eji ya.

Ihe Ndị Na-Enyere Ihe Nlọgharị Ihe Mbipụta: Ogologo, Mme, Nchịkọta

Ihe ọrụ na-abụkarị site na ihe atọ:

• Ogologo : Ike na-emechi site na oge—aproximately 8% karịa maka 0.5m karịa 1.5m
• Materila : Ndịdaaka steel Grade 43 nwere ike inwe ike karịa 15% dibensu na aluminum
• Ịpụta : Ịpụta na-adị ọcha ike site na 40% n'ime akụkụ dị elu karịa 2.5m

Ịgba n'obi maka Ịdịbeghị: Aghọtara Ihe Nchọgharị Na Mbipụta Mburu Ebe Obibi

Ndị ọrụ n'indistri pụtara njehie 23% n'etiti mbipụta laboratorị na aghọtara n'obodo (Journal Ọnwụwe Njikwa 2023). Ndị isi ihe omume dị ka ebe osise ahụ dị ghara ike (nke na-egbu ike site na 18–35%), mgbanwe obosara n'oge ngosi konkreti, na eriri n'ime obodo ọwụwa anyanwụ.

Ịhọrọ Akụba Acrow N'ọnụọgụgụ Na Mbipụta Load Gbasara Ya

Gbanwee akụba ndị gbasara ya site na EN 1065 ma ọ bụ BS 4074. Mgbe ị na-eji formwork elu (>15 kN/m²), jiri akụba 20kN ebe dị ka ±1.8m ma ọ bụ akụba abụọ nwere cross-bracing maka akụkụ elu karịa 4m. Meghachite mbipụta load dịka enyere ya site na onye njikwa strata ahụ ma ọ bụrụ na ị na-agbakwunye ya na ntụkwasị obere ụzọ ndị fabricant.

Ụkpụrụ Njikwa Na Ịgbaghara Ihe Njikwa Mgbe Ị na-eji Akụba Acrow

Leksa Akụba Acrow Iji Mee Ntụnye Banyere Mmadụ Ebighị Ebi

Nchekwa nke ọma ka a ghara ime ụtụ 72% nke ihe mere eme na ngwaọrụ (Ihü Njikwa Ọrụ 2023). Lee maka:

• Igbechara ma ọ bụ nnukwu n'ime ọnụọgụ stili tubular
• Ịkparịta ụka karịa 10% nke obere aga
• Ụgbọ mmiri na-akwado na ọnụ ọgụgụ nhazi
• Iziga njikere dị nro n'ime njikere

Ịkwadebe Obere Aga na-Enye aka Iji Mee ka Emechara ma ọ bụ Akpata

Kpebie ike site na plates stili nke pụtara ya maka diameter prop. maka akpụkpọ nkụ:

1. Wepu ihe mkpofu site na mpaghara ndokwa
2. Jiri wedges nyere aka n'ime mpaghara enweghị aka ±5°
3. Tinye pads nyere aka n'ime stili akpụkpọ nkụ

Ndịda a na-eme ka ọ dịrị n'ọnụ ọgụgụ 40% karịa imeputa nke ohere (Akwụkwọ Akụkọ Mmepụta 2022).

Ịhazi ya site na Iji Ulo na Njikọtakwulu Nchekwa Mgbe Ekekọrịta

Jiri njikọtakwulu n'otu akụkụ nwere ike 3° mgbe ekekọrịta. Gbanwee ndị a nchekwa:

• Njikọtakwulu baseplate: ≥90% njikọ ya na agwa
• Iguzoguzo njikọ: 0.5mm kacha mma
• Oge bekee: ±28ụbọchị ekpere ekpere

Ịhazi ngwaahịa: Ndị mmalite kachasị elu ma ọ bụrụ na njikọtakwulu kachasị elu

Ndị Acrow modern na-enyere aka n'ime 20kN na 50kN, mana mgbanwe ndụ inwe ezi uche na-adịgbee n'ime ihe karịrị 12 percent n'okpuru gburugburu ha. Kedu ihe mere ka nke a hapụta? Ee, dị ọtụtụ ihe. Mbụ, dị iche iche ihe na-enyere aka n'ime teleskopụrụ ahụ. Nke abụọ, e nwere ihe ngosi na-adịghị mma mgbe ị na-ejikwaa formwork, ihe dị ka engineers dị mkpa ọ bụla ekweghị ya. Ma sị n'akụkụ Mother Nature onwe ya - ọchịchị na corrosion nwere ike ime ka steel strength kpari site na 9 ruo 15 percent mgbe ọ na-aga. Gbasara akụnta akụ akụ published afọ gara aga site structural engineers, ọ dị mfe ime ka props a pịa ruo 70 percent nke ha enyere maka mgbe ị na-arụ ọrụ n'ime projects dị mkpa mgbe safety bụ ezigbo oké.

FAQ

Kedu ihe ndị Acrow prop na-eji ha mee?

Acrow props bụ njikọ oka na-enye aka na-construction iji nye aka mbido n'elu dị ka mgbe ọ dị formwork ma ọ bụ mgbe ị na-arụ ọrụ gbajie.

Ị dị ka ọ ga-amata ụkọ na-enye akwụkwọ Acrow?

Ụkọ na-enye akwụkwọ Acrow a ma site na ike mkpofu, ike ime, na ohere n'akụrụ site. Gbalịa ịlele isi ike onye ọrụ nrụpụta maka ụkọ zuru oke.

Kedu ihe Acrow props ga-ebute ya maka mmalite zuru oke?

Mee ka baseplates wepụ at least 3x diameter nke prop, ji leveling wedges mee ka ọ dị mma, na gbanwee vertical alignment within 3° nke plumb mgbe ị na-arụsi ozi.

Kedu ihe ndị pụtara mgbe Acrow prop apụghị?

Ihe ndị pụtara mgbe Acrow prop apụghị bụ: imechara ihe ndị dị iche iche, ike ghara icheta mgbe e wepụ formwork, na ihe omume dịka corrosion na temperature changes nwere ike ịdịpụta ike steel.