格式:pdf
大?。?span class="single-tag-height">27KB
頁數(shù): 18頁
1 頂管施工中的泥漿技術(shù) 摘要:對(duì)于管外壁摩阻力,在很大程度上可以通過各種 手段來施加影響。首先要注意管子表面的光潔平滑,以保持 很低的摩擦系數(shù)。此外極為重要的是,管子要盡可能避免圓 度誤差,并保持直徑的一致。在這方面,如果管子是用許多 管模制造的,問題可能就出現(xiàn)在制管廠中,因?yàn)楣苣1緛砭?有尺寸公差,而且磨損程度也不相同。此外,如果管子澆注 之后脫模過早,或者由于蒸養(yǎng)而發(fā)生收縮,也會(huì)引起這類的 偏差。管子尺寸的不準(zhǔn)確在推頂時(shí)會(huì)導(dǎo)致產(chǎn)生夾緊力,這種 力有時(shí)可能達(dá)到很高的數(shù)值。 關(guān)鍵詞:頂管施工泥漿若使刃腳比它相應(yīng)于管子外徑應(yīng) 有的尺寸稍大一點(diǎn),就有可能降低管外壁摩阻力。這樣能使 上層不直接壓在管體上。只要土層足夠堅(jiān)硬,這種方法就會(huì) 取到預(yù)期的效果。而如果向管子和土層之間形成的空隙內(nèi)壓 人支承介質(zhì),這種方法的效力更可以大大提高,并能維持一 定的時(shí)間,從而足以頂進(jìn)一段相當(dāng)長的管路,再則,支承
格式:pdf
大?。?span class="single-tag-height">412KB
頁數(shù): 5頁
Pipe jacking has become a popular method in drainage construction in Hong Kong. However, the varied ground conditions encountered in reclaimed land may pose severe problems to pipe jacking operation. This paper presents the experience of using the full face slurry shield for pipe jacking in a reclaimed area. The study shows that the full face slurry shield with a rock cutting head performs satisfactorily. To ensure the machine can work effectively in all ground conditions, other factors need to be considered including the rock cutting head being worn away, the hitting of under ground structures, the sustainability of jacked pipes alignment, the associated ground settlement and the damage to the jacked pipes caused by the jacking pressure.