橋涵施施工工技術(shù)術(shù)第19講預(yù)預(yù)應(yīng)力力先張法法19.1預(yù)應(yīng)力張張拉19.2預(yù)應(yīng)力放放張19.3工程實(shí)例例先張法臺(tái)座預(yù)應(yīng)力先先張法19.1預(yù)應(yīng)力張張拉制梁工藝藝立模澆筑筑混凝土土至達(dá)到到規(guī)定強(qiáng)強(qiáng)度逐漸將預(yù)預(yù)應(yīng)力筋筋放松澆筑混凝凝土前張張拉預(yù)應(yīng)應(yīng)力筋臨時(shí)錨固固在張拉拉臺(tái)座上上19.1預(yù)應(yīng)力張張拉承受預(yù)應(yīng)應(yīng)力筋在在構(gòu)件制制作時(shí)的的全部張張拉力臺(tái)座受力力后要求求不移動(dòng)不傾覆不變形預(yù)應(yīng)力先先張法19.1預(yù)應(yīng)力張張拉預(yù)應(yīng)力先先張法19.1預(yù)應(yīng)力張張拉張拉可分分單根張拉拉和多根整批批張拉兩種。多根整批批張拉時(shí)時(shí)為使根根力筋的的初應(yīng)力力基本相相等，在在整體張張拉前要要進(jìn)行初調(diào)應(yīng)應(yīng)力，應(yīng)力力一般般取張張拉應(yīng)應(yīng)力的的10~15%。預(yù)應(yīng)力力先張張法19.1預(yù)應(yīng)力力張拉拉預(yù)應(yīng)力力先張張法19.1預(yù)應(yīng)力力張拉拉張拉橫橫梁和和千斤斤頂預(yù)應(yīng)力力先張張法19.1預(yù)應(yīng)力力張拉拉力筋在在張拉拉端的的接長(zhǎng)長(zhǎng)預(yù)應(yīng)力力先張張法19.1預(yù)應(yīng)力力張拉拉預(yù)應(yīng)力力筋的的放張張，必必須待待混凝凝土養(yǎng)養(yǎng)護(hù)達(dá)達(dá)到設(shè)計(jì)規(guī)規(guī)定的的強(qiáng)度度后才可可以進(jìn)進(jìn)行。。放張預(yù)預(yù)應(yīng)力力筋的的方法法：千千斤頂頂放張張；砂砂筒（（箱））放張張；滑滑楔放放張；；螺桿桿、張張拉架架放張張等。。砂筒放放松示示意圖圖19.2預(yù)應(yīng)力力放張張預(yù)應(yīng)力力先張張法19.2預(yù)應(yīng)力力放張張1橫梁2夾具3螺桿4張拉架架5預(yù)應(yīng)力力筋6構(gòu)件7承力架架螺桿、、張拉拉架放放松示示意圖圖鋼滑楔楔預(yù)應(yīng)力力先張張法19.2預(yù)應(yīng)力力放張張19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例先張法法場(chǎng)地地預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力筋安裝預(yù)預(yù)應(yīng)力力鋼筋筋預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例鋼絞線線一端端預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例綁扎鋼鋼筋預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例空心板板梁的的內(nèi)襯襯氣囊囊安放氣氣囊的的位置置氣囊涂脫模模劑預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例立模板板澆筑混混凝土土預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例養(yǎng)生生預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例拆模模預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例測(cè)量空空心板板梁的的縱向向收縮縮切割預(yù)預(yù)應(yīng)力力筋（（不能一一次性性割斷斷一束束，必必須分分批割割斷）預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例鑿出連連接鋼鋼筋預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例質(zhì)量檢檢查預(yù)應(yīng)力力先張張法19.3工程實(shí)實(shí)例檢查外外觀檢查彎