重载铁路特长单线隧道长仰拱施工技术研究
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摘要
重载铁路特有的总重大、运量大、轴重大、密度高的行车特点,对隧道仰拱破坏力极大,越来越多的隧道基底出现开裂、破损、下陷及翻浆冒泥等病害,对运营造成极大的影响,因此对仰拱的施工质量要求高。本文依托蒙华重载铁路崤山隧道,在工期紧、单线作业空间小且安全步距的限制条件下,进行24 m全液压履带式栈桥工装设计改造,运用MIDAS软件建模进行稳定性计算分析。在全线第一长隧付诸实施,避免了施工干扰、加快了仰拱施工进度、解决了仰拱弧形模板安拆不便的难题,减少了仰拱混凝土环向施工缝、保证了仰拱的整体性、提高了仰拱的施工质量,保证了洞内施工交通运输安全,节省劳力、操作简单,可为今后其他类似工程提供借鉴。
Heavy-haul railway has the special driving characteristics of large total weight, large capacity, heavy axle load,high density, and great damage to tunnel inverted arch. More and more diseases such as cracking, breakage, subsidence and mud pumping occur in tunnel basement, which have a great impact on the operation. Therefore, the construction quality of inverted arch is required to be very strict. Relying on the Xiaoshan Mountain Tunnel of Inner Mongolia-Jiangxi Railway,in the restriction conditions of the tight term of works, small single space and safe distance step, research on the design modification of 24 m full hydraulic crawler pier equipment was conducted, and its stability analysis was made by MIDAS software modeling. The feasibility of the construction technology was verified in the first long tunnel of Mongolia-Jiangxi Railway, avoiding construction interference, speeding up the construction progress of tunnel inverted arch, and the problems of the inconvenient installation and removal of the arc formwork of tunnel inverted arch were solved, besides,the concrete circumferential construction joint was reduced, the integrity was ensured, and the construction quality was improved. Thus,the safety of traffic and transportation in the tunnel was ensured, saving labor and operating easily. The construction technology could be used as reference for other similar projects in the future.
Heavy-haul railway has the special driving characteristics of large total weight, large capacity, heavy axle load,high density, and great damage to tunnel inverted arch. More and more diseases such as cracking, breakage, subsidence and mud pumping occur in tunnel basement, which have a great impact on the operation. Therefore, the construction quality of inverted arch is required to be very strict. Relying on the Xiaoshan Mountain Tunnel of Inner Mongolia-Jiangxi Railway,in the restriction conditions of the tight term of works, small single space and safe distance step, research on the design modification of 24 m full hydraulic crawler pier equipment was conducted, and its stability analysis was made by MIDAS software modeling. The feasibility of the construction technology was verified in the first long tunnel of Mongolia-Jiangxi Railway, avoiding construction interference, speeding up the construction progress of tunnel inverted arch, and the problems of the inconvenient installation and removal of the arc formwork of tunnel inverted arch were solved, besides,the concrete circumferential construction joint was reduced, the integrity was ensured, and the construction quality was improved. Thus,the safety of traffic and transportation in the tunnel was ensured, saving labor and operating easily. The construction technology could be used as reference for other similar projects in the future.
引文
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[2]马辉,刘仁智,陈寿根,等.当前铁路隧道施工亟待解决的若干技术问题[J]现代隧道技术,2011,48(5):1-6.
[3]张育林.长仰拱栈桥在隧道施工中的应用分析[J].建设科技,2017(11):120-121.
[4]李有业,任国臣.单洞双线高速铁路隧道Ⅲ级围岩仰拱快速施工技术[J].隧道建设,2013,33(7):586-590.
[5]蒋晖光,陈文超.隧道仰拱长栈桥施工应用[J].隧道建设,2012(S2):187-189.
[6]杨然.自行式仰拱栈桥设计及施工技术研究[J].中国公路,2017(14):101-103.
[7]陈永照.高速高速铁路隧道仰拱衬砌结构力学特性及快速施工技术研究[D].北京:中国铁道科学研究院,2012:34-38.
[8]盛重权,张江涛.隧道仰拱机械设备配套快速施工技术[J].施工技术,2013(S2):217-219.
[9]徐冬青.隧道仰拱整体式浇筑设备的研制及应用[J].铁道建筑技术,2012(3):80-82,87.
[10]田晓峰.长大隧道自行式移动仰拱栈桥研制及施工技术[J].施工技术,2017,46(15):120-123.
[11]武明静.万荣隧道24 m自行式仰拱栈桥施工技术研究[J].铁道建筑技术,2017(8):84-87.
[12]张勇,王云波,刘仁智,等.铁路双线隧道仰拱快速施工技术及配套设备的研制[J].高速铁路技术,2014,5(1):93-97.