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    大型塔器吊裝工藝
    RSS 打印 復制鏈接 發布時間:2017-05-22 14:13:36

     大型塔器吊裝工藝

      [摘要]隨著石油化工工藝的發展和裝置規模的增大,大型塔器吊裝工作廣泛用于空分裝置、石油化工等行業,本文著重介紹該低壓塔的吊裝工藝,對同類吊裝具有推廣意義

      [關鍵詞]塔器,溜尾,平衡梁

      一、工程簡介

      2007年我公司在邯鄲市銳達動能有限責任公司35000m3/h制氧機項目空分裝置——粗氬塔、中壓塔和低壓塔的吊裝,采取了科學的吊裝工藝,為該工程提供了方便、快捷、安全、可靠的技術保障。

      由于受現場條件限制和考慮塔器吊裝的需要,塔體吊裝過程中應與冷箱的組裝相銜接,避免影響施工進度。主冷箱鋼結構安裝到60.630米(西側梁安裝到36.330米),面板安裝到59.730米(西側面板安裝到36.330米)時,進行塔的吊裝對接工作。西側冷箱+36.330~+60.630米的梁,加筋及面板需在低壓塔吊裝完后方能安裝。

      二、塔器的吊裝

      2.1吊車的選用

      根據現場勘查,施工場地的周圍環境條件不理想,整個裝置布局緊湊,吊裝施工作業空間小,結合被吊裝設備的最大重量、設備吊裝高度以及安裝的位置、起重機械的技術參照等綜合考慮,選用400T履帶吊、200T液壓吊各一臺。

      2.2吊裝方法

      設備吊裝主要采用滑移法進行吊裝,主吊車采用平衡梁提升設備上部,溜尾吊車提尾。

      2.3吊裝計算及校核

      根據圖紙提供的設備參數,低壓塔的組對和吊裝難度大,上下塔吊裝時主吊車站位相同,在此僅對低壓塔吊裝作具體分析,粗氬塔、中壓塔吊裝方法類同。

      2.3.1低壓塔吊裝

      2.3.1.1低壓塔的吊裝參數

      直徑:φ3.519m;高度:35.081m;重量:68.76T。

      2.3.1.2吊車站位:主吊車400T履帶吊位于主冷箱的南面,溜尾吊車200T位

      于設備的西面。具體位置尺寸見下圖。  

      2.3.1.3步驟:用400T履帶吊采用平衡梁提升設備上部,200T液壓吊車送尾。將低壓塔立起之后,200T吊車松鉤。將塔吊起從冷箱西側進入于中壓塔對接。

      2.3.1.4核算:

      根據吊車性能表,400T履帶吊,回轉半徑18米,臂桿長度84米時,起吊能力為76T大于吊裝荷載75.636T(吊裝荷載為低壓塔重量68.76T×1.1=75.636T),所以選用400T履帶吊能夠滿足吊裝要求。

      按照設備吊耳設置的位置,提吊設備底部的吊車荷載應大于1/2倍設備吊裝荷載75.636T×1/2=37.818T。根據200T液壓吊吊車性能表,回轉半徑10米,臂桿長度22.3米時,起吊能力為50.3T大于吊裝荷載37.818T,所以選用200T液壓吊能夠滿足吊裝要求。

      2.3.2吊索及平衡梁

      2.3.2.1為了避免提吊的設備發生變形,需制作平衡梁1根。

      平衡梁制作示意圖: 

      2.3.2.2吊索

      (1)主吊車使用吊索數量2根;規格6×37---φ56.5,σ=170kg/mm2;每根長度28m,一彎兩股拴掛。

      溜尾吊車使用吊索數量2根;規格6×37---φ56.5,σ=170kg/mm2;每根長度20m,一彎兩股拴掛。

      (2)核算

      吊車掛鉤上吊索角度圖: 

      通過查看鋼絲繩破斷力對照表,對于6×37---φ56.5,σ=170kg/mm2的鋼絲繩的最小破斷力為164t,乘以安全系數1/6,最小破斷力變為27.3t。

      鋼絲繩受力為43.6/[2cos(52/2)]=24.25t<27.3t

      通過校核滿足強度要求。

      2.3.2.3平衡梁的計算

      (1)選取φ273×10無縫鋼管做平衡梁。

      (2)梁的抗彎截面模量計算

      W=π(D4-d4)32D=π(27.34-25.34)/32×27.3=524cm2

      (3)梁的截面積計算

      F=π/4(D2-d2)=π/4(27.32-25.32)=82.6cm2

      (4)梁受到的正壓力

      Py=Q/2=68.76/2=34.38t

      Px=Pytg30°=34.38tg30°=19.85t

      彎距M=Pxa=19.85×23=456.55t.cm

      正壓力&=Pxa/F=19.85×103/82.6=247.52kg/cm2

      (5)梁實際受到的應力

      δ=Ma/W+&=456.55×103/524+247.52=1144.94kg/cm2

      (6)梁的強度校核

      δ=1144.94kg/cm2<{δ}=1600kg/cm2

      通過校核梁的強度滿足吊裝要求。

      三、安全措施

      3.1施工前向施工人員進行安全技術交底,填報檢查表和吊裝指令書。

      3.2吊裝前應仔細檢查繩索的完好狀況,繩索的捆綁不得損傷機件。

      3.2吊車性能應滿足吊裝工藝要求,警報和液壓系統必須可靠。

      3.3設備吊裝前應進行試吊,應觀測吊裝凈距離及吊車支腿處地基變化情況,發現問題應先將設備放回地面,故障排除后重新試吊,確認一切正常,方可正式吊裝。

      3.4吊裝過程中,應保持吊裝動作平穩。待設備就位后應及時找正,設備未固定前不得解開吊裝索具。

      3.5開始松輔助吊車吊鉤時,設備的仰角不宜大于75°。

      3.6兩臺吊車拾吊設備時,各吊車間的動作必須協調一致。指揮信號要準確、可靠。

      3.7主吊吊車必須設置平衡梁,鋼絲繩應拴在設備專用吊耳上,以免鋼絲繩擠傷和擠裂設備本體。

      四、技術經濟效果分析

      4.1施工方便、快捷、安全、可靠,提高機械效率55%。

      4.2工程質量易于保證。

      4.3施工進度快,工序銜接緊湊,節省工期,施工工期減少40%。

      4.4投入吊車臺班和人工減少,節約成本。降低成本12%,人工費節約40%,

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