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大型儲罐內(nèi)部可移動式腳手架設(shè)計及施工方案中英對照-資料下載頁

2024-10-20 14:54本頁面

【導讀】N36--------52根立桿所承受的總載荷,包括恒載荷和動載荷;NG1K-----------腳手架結(jié)構(gòu)所有鋼管自重標準值產(chǎn)生的軸向力,即恒載荷之一部分;∑NQK---------施工載荷標準值產(chǎn)生的軸向力的總和,即動載荷。Wφ48----------鋼管的單位重量,Wφ48=;LV1=6m/piece*52piece=312m------第一部分立桿長度之和;LH2=m/layer*2layers=165m-------第二部分橫桿長度之和;LobliqueC=*2+*8*3=268m-------C方向斜桿長度之和;Lother--------------腳手架中所有其它短連接桿件長度之和,一般情況下按立桿、橫桿與斜。桿之和的20%計算。

  

【正文】 P=**= ∴選用了 3 套 10T/套的手拉葫蘆來拉動整個腳手架是完全符合要求的。 Therefore, use 3 sets of 10T/set Chain Blocks could move overall structure and meet requirement. 即,當 3 套 10T/ 套的 手拉葫 蘆同 時受 力時 ,每 套手 拉葫 蘆的 受力為P/3=that is, when these 3 sets of Chain Blocks bearing loading, the loading on each set of Chain Blocks shall be P/3= 移動腳手架時受力點的布置 The Force Points Arrangement 如圖 5 DD 視圖( Fig 5 DD sketch) 所示,當要腳手架整體往罐中心移動時,牽引點固定于中心集水坑旁邊,腳手架的受力點選擇 a,d,e;當要腳手架整體往側(cè)面移動時,牽引點固定于腳手架的側(cè)面,如果牽引點附近有罐壁管口的話,可以選擇罐壁管口作為牽引點,從而免除在罐底板處焊接的次數(shù),而此時腳手架的受力點選擇為 a,b,和 c點。 See Section View DD( Fig 5 DD sketch) , when the tower need to be moved to tank center, the force points shall be fixed near the center sump, point a, d and e on tower shall be adopted as connection points。 when the tower need to be moved to side way, the foce points shall be fixed on the side of it. If there is nozzles on shell nearby, the pull chain block should be fixed on them as as to decrease the welding pots on bottom plate. And the force points on tower shall be point a, b and c. 牽引點的強度校核 The Strength of Force Points 正常情況下,三個手拉葫蘆應(yīng)該是同時受力的,但考慮到安全系數(shù),在此,我們假設(shè)只有一個牽引點起作用時,牽引點的焊接面積達到多大時便能滿足強度要求。 Under general condition, three sets of chain blocks shall bear loading evenly. However, considering the safety factor, here, we imagine only one set works, the following shows how much welding area could meet requirements. ∵ P= P/[б ]= 178。 式中 here [б ]—— Q235B 3 號鋼的容許應(yīng)力, [б ]=170Mpa 。 Q235B 3 steel Allowable Stress, [б ]=170Mpa 。 ∴選用的牽引點只要與底板的焊接面積大于 436 mm178。便可以滿足要求。 Therefore, if the welding area is larger than 436 mm178。, its strenght could meet requirement.
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