公路隧道通风竖井及支护施工技术研究

发布时间：2018-06-18 05:09

本文选题：通风竖井开挖 + 支护施工　；参考：《公路工程》2017年03期

【摘要】：以杭州市紫之隧道工程土建第Ⅱ标段1#竖井与2#竖井为工程实例进行通风竖井及支护施工技术研究。对施工工艺中各关键步骤进行分析共得出以下几点结论:给出了钻孔爆破方法,炸药用量计算方法及孔洞分布位置设计原则;第一次爆破先在竖井中心从上向下凿岩机凿孔,采用桶形爆破法,凿孔深度2~2.5 m,炮眼排距0.9 m,每孔装药量平均1.28 kg,爆破形成直径2.5 m导洞至下层通道。井身开挖采取上而下爆破、循环进尺、每次深度按2 m开挖,逐次往里下挖方式。开挖全部完成后进行竖井初支与二次衬砌,二次衬砌每10 m设一壁座,壁座尺寸在普通衬砌结构的基础上加大150 cm;待加强段衬砌砼强度达到设计70%后,继续搭设脚手架,安装模板,自下而上依次衬砌施工。
[Abstract]:The construction technology of ventilation shaft and support is studied with the examples of 1# shaft and 2# shaft in the second section of the civil construction of Hangzhou Zizhi Tunnel Project. The key steps in the construction process are analyzed and the following conclusions are drawn: the drilling blasting method, the calculation method of explosive dosage and the design principle of the hole distribution position are given, and the first blasting is first drilled from the shaft center from the top down rock drill. The barrel blasting method was used. The hole depth was 2 ~ 2. 5 m, the hole spacing was 0.9 m, the average charge per hole was 1. 28 kg, and the diameter of 2. 5 m guide hole to the lower tunnel was formed by blasting. The shaft is excavated by blasting from top to bottom, with circular ruler, and the depth of each excavation is 2 m, and the method of digging in and down step by step is adopted. After the excavation is completed, the primary and secondary lining of the shaft is constructed, and every 10 m of the secondary lining is provided with a wall seat, and the wall base size increases 150 cm on the basis of the ordinary lining structure. After the strength of the reinforced section of the lining concrete reaches 70% of the design, the scaffold is continued to be erected. Install template, from bottom to top lining construction.
【作者单位】：重庆广播电视大学;西南交通大学土木工程学院;
【基金】：重庆市教委科学技术研究项目(kj091604)
【分类号】：U455.4

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