简介:摘要本文对承压水层地连墙渗漏的处理办法进一步加以介绍,并且通过现场的摸索,对承压水地层下盾构接收、始发的施工技术进行总结。在施工过程中,通过优化设计方案,在成风井结构没有完成的情况下,盾构先行通过空推的方式穿过了风井,使盾构的工期得到节约。在类似工程中本文总结的方法具有一定的推广性,能够使工期得到节约,并降低施工风险。
简介:北京地铁 17 号线区间隧道采用盾构先行通过后横向暗挖风道的施工工艺,上层风道跨越盾构隧道开挖至端墙,下层风道开挖临近至盾构隧道.在上层风道二衬结构保护下,采用倒挂井壁法开挖盾构隧道两侧土体,施工竖井二衬,保留盾构隧道范围内的下层风道侧墙及底板不施工,以保证后期施工安全.通过风道中板预留吊装孔,对管片逐环拆除,然后施工盾构隧道范围内的下层风道侧墙及底板.风道横向暗挖之前,为防止盾构隧道变形,减小地表沉降,需先对风道范围之外的管片采取径向注浆、纵向拉紧、设置环向支撑等加固措施.因需要进行多次受力转换,采用荷载-结构法对二衬结构进行各阶段内力分析.采用地层-结构法对开挖风道、竖井、拆除管片进行各阶段变形及应力分析,结果表明,地表沉降满足要求.监测结果反映地表沉降达到 99.1mm,主要原因为竖井开挖到底后,因遇到承压水,未及时封底,导致支...Abstract:The interval tunnel of Beijing Metro Line 17 adopted the construction technology of a shield first passing through and then transversely excavating the air duct.The upper air duct was excavated across the shield tunnel to the end wall,and the lower air duct was excavated adjacent to the shield tunnel.Under the protection of the secondary lining structure of the upper air duct,the soil on both sides of the shield tunnel was excavated by the inverted shaft wall,the secondary lining of the shaft was constructed,and the side wall and bottom plate of the lower air duct within the scope of the shield tunnel were not constructed to ensure the safety of the later construction.The hoisting holes were reserved throug...
简介:说凹村的风之前,得说说凹村的样子。左右都是山坡,各不相同,也不对称,有高有底,有急有缓,最后殊途同归,汇集在硬板子山上。硬板子山偶尔长些杂树杂草,不长草的地方,露出白花花的石板。上了年纪的人说,这山老了,患上了白癜风。不管是不是得了白癜风,硬板子山是凹村离天空最近的山,活在高处,过着神仙的日子。凹村坐落在两坡之间,硬板子山之下,既像硬板子