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鉆孔灌注樁和預應力管樁的優缺點

發布時間:2020-09-08人氣:60

 鉆孔灌注樁成樁工藝的關鍵在于泵送混凝土。成樁過程中必須保證排氣閥管樁正常工作。泵送的混凝土要有良好的可泵性和流動性,防止發生離析泌水。但是實際施工中也存在坍落度達不到規范要求的現象。坍落度過小,影響泵送效率甚至發生堵管;坍落度過大,則易離析泌水。長螺旋鉆孔灌注樁的施工效率高,成樁速度可以達到:15-22米/根/天>30-50根。相對與沉管樁等其他樁型,它低噪音,適于在城區內施工。

在結構承受外荷載之前,預先對去在外荷載作用下的受拉區施加壓應力,以改善結構使用的性能的結構型式稱之為預應力結構。 在受彎構件的荷載加上去之前給構件施加預應力就會產生一個和與荷載作用產生的變形相反的變形,荷載要構件沿他作用方向發生變形之前必須最先把這個與荷載相反的變形抵消,才能繼續使構件沿荷載方向發生變形。這樣,預應力就象給構件多施加了一道防護一樣。


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