The tower shafts , most of which are hollow and varying in cross section , and altitudinal construction bring trouble to the form work and the stress of strand wire . and the cracks on the crossbeams will be caused by the following - deformation of the bracing structure joints , elastic deformation , uneven settlement and temperature changes . the additional stress of the base slab and the foundation is caused by the deviation of cable bent tower construction 但大跨度橋梁混凝土索塔施工設(shè)備進(jìn)場及現(xiàn)場管理都比較困難;塔柱多為空心變截面,且為高空作業(yè),給模板工程及預(yù)應(yīng)力張拉帶來一定困難;支撐系統(tǒng)連接的間隙變形、彈性變形、不均勻沉降以及環(huán)境溫差可導(dǎo)致橫梁裂縫;索塔施工偏位會引起的承臺和基礎(chǔ)的附加應(yīng)力,對加勁梁的架設(shè)影響大;懸吊結(jié)構(gòu)未完體系(架設(shè)時(shí))施工階段的風(fēng)致振動往往影響到施工的安全和質(zhì)量;實(shí)心塔柱部分體積較大,易產(chǎn)生溫度裂縫。
The factors included the characters of terranes and weak interbeds and the intersections with slope surface ; the characters and combinations of structure joints and the intersections with slope surface ; combinations of lithology ; dualistic structure of m - shaped slope made up of red rockmass and overlying deposit soil 按紅層邊坡巖體結(jié)構(gòu)狀態(tài),把紅層邊坡巖體結(jié)構(gòu)劃分為4種,然后又按紅層邊坡巖體的巖性組合特征、巖層產(chǎn)狀與坡面產(chǎn)狀的關(guān)系、結(jié)構(gòu)面的發(fā)育情況及其與坡面的關(guān)系、以及上覆堆積土的邊坡巖體的坡頂線形狀和巖土組合特征細(xì)分為13個(gè)類型和亞類。