40米跨箱梁滿堂支架施工方案范文(存儲(chǔ)版)
【正文】 m2 砼澆注沖擊及振搗荷載：P4 = 200 kg/m2 = 2 kN /m2 則有P = （P1 + P2 + P3 + P4）= kN /m2 W = bh2/6 = 6122/6 =144 cm3 由梁正應(yīng)力計(jì)算公式得： σ = qL2/ 8W = （）1000 / 8144106 = Mpa ＜ [σ] = 10Mpa 強(qiáng)度滿足要求； 由矩形梁彎曲剪應(yīng)力計(jì)算公式得： τ = 3Q/2A = 3（）103（ /2）/ 2612104 = Mpa＜ [τ] = 2Mpa（參考一般木質(zhì)） 強(qiáng)度滿足要求； 由矩形簡支梁撓度計(jì)算公式得： E = 105 Mpa； I = bh3/12 = 864cm4 f max = 5qL4 / 384EI = 5103103 / 38486410811010 = ＜ [f] = （ [f] = L/400 ） 剛度滿足要求。 另由壓桿彈性變形計(jì)算公式得：（按最大高度11m計(jì)算） △L = NL/EA = 10311103/105102 = 壓縮變形很小 單幅箱梁每跨混凝土340m3，自重約884噸，按上述間距布置底座，則每跨連續(xù)箱梁下共有765根立桿，可承受2525噸荷載（每根桿約可承受33kN），比值為2525/884 = ，完全滿足施工要求。玻璃鋼竹膠板存放時(shí)板面不得與地面接觸，要下墊方木，邊角對齊堆放，保持通風(fēng)良好，防止日曬雨淋，并定期檢查。如果拆模時(shí)間過早，容易造成箱梁頂板砼下饒、開裂，甚至倒坍；如果拆模時(shí)間過晚，將增大了拆模難度，造成拆模時(shí)間長且容易損壞模板?？烧{(diào)絲桿的上端與模板采用鉸聯(lián)結(jié)，下端與翼緣模板下方的橫向I14工字鋼鉸聯(lián)結(jié)，每塊模板下方的3根橫向工字鋼通過鋼筋連成整體，橫向工字鋼安裝在順橋向外側(cè)模行走軌道上（縱向I14工字鋼）。為確保外側(cè)模和翼緣模能夠順利行走，應(yīng)確保模板脫離砼面不小于8cm。 四、混凝土施工 混凝土配合比的設(shè)計(jì)及要求 ?、倩炷翉?qiáng)度等級為C50 ?、谒啵?。 由于其它標(biāo)段的箱梁澆注均出現(xiàn)了不同程度的問題，如腹板砼冷縫及分層現(xiàn)象較明顯、頂板砼表面有裂紋、箱梁內(nèi)翻漿現(xiàn)象嚴(yán)重。③砼表面抹面不力，沒有修漿。 按照示意圖所示的澆注工序進(jìn)行，有效地控制了每一層砼的澆注厚度，既有利于砼振搗，又有效地減少了底板砼的翻漿現(xiàn)象，同時(shí)有效地控制了每一次砼澆注后的布料間隔時(shí)間?？傊?，兩者各有優(yōu)缺點(diǎn)。 Five, contract signing and client identity, signature, fingerprint is clear。 more than a oneyear personal loan, extended term today added to the original term of the loan shall not exceed the maximum loan under the loan terms. apply in prepayment prepayment a borrower shall be in writing and, after it has been accepted。 Four, the pledgor, mortgagor due to special reasons not to sign the contract, may authorize others to sign the contract and retained after the notary notarized power of Attorney (parties abroad, outside the territory of China sent or delivered by a power of attorney shall be certified by the notary public of the country, and certified by the Embassy or Consulate in the country). Agent required to audit mandates are clear, the content is plete (a power of Attorney sample record form five), whether the expiration date within PART_STORE_00102). Rule2 2nd set of goods was moved to the 2nd from the left the cage inside the vehicle Click on smart properties of oriented window screen to the right of [login rule] the period of validity, and audit the original identity card of the authorized person, and keep copies. Contracts signed by the authorized person authorized, in the signature bar marked authorized person, and signed by the authorized person39。如果采用水箱加水法進(jìn)行預(yù)壓，建議在水箱底部設(shè)計(jì)若干滾輪或滾軸，以便2~3人就能推動(dòng)水箱前移。⑤砼澆注時(shí)氣溫偏低或雨天澆注。頂板砼表面出現(xiàn)裂紋是由以下一種或幾種原因引起①澆注氣溫過高或風(fēng)干現(xiàn)象嚴(yán)重造成砼表面容易開裂。 箱梁混凝土澆筑 由于砼為整跨澆注，方量較大，澆注時(shí)間長，首跨澆注方量為408m3，標(biāo)準(zhǔn)跨每跨澆注方量為340m3。故在張拉完成之前模板能夠全部行走到位后。 當(dāng)砼強(qiáng)度達(dá)到設(shè)計(jì)強(qiáng)度的50%～60%時(shí)，方可脫離外側(cè)模板和翼緣模板。經(jīng)受力驗(yàn)算和施工檢驗(yàn)，此模板強(qiáng)度和剛度完全能夠滿足施工要求。經(jīng)受力驗(yàn)算，內(nèi)模及內(nèi)模支架均能滿足規(guī)范要求，
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