新型浅埋暗挖法预加固技术及其应用研究

发布时间：2018-01-21 22:23

本文关键词： 浅埋暗挖预加固大管棚改良袖阀管注浆　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：近些年,随着我国城市轨道交通的发展,地铁工程日益增多,在城市地下工程中,一般埋设深度较浅、地质条件较差,越来越多的工程采取浅埋暗挖法进行施工。在施工过程中容易引起地表较大沉降,当隧道临近或穿越重要建筑结构或地下管线时,所允许的地下沉降就非常严格,所以浅埋暗挖施工过程中必须严格控制施工影响。在浅埋暗挖施工工序中,预加固技术又是保证浅埋暗挖施工安全的关键工序之一。本文在广泛调研基础上,深入研究了浅埋暗挖法施工技术要点特别是浅埋暗挖法预加固技术要点,完成了以下几个方面的研究工作:1、阐述了各种浅埋暗挖法预加固技术措施特点,从施工技术、施工成本及施工效果上详细比较了水平旋喷桩预加固、大管棚预加固技术和注浆法预加固技术;2、根据大管棚预加固技术和注浆预加固技术要点,提出了新型大管棚预加固技术:大管棚钢管采用的是φ108管棚,大管棚按照2.0m~3.5m短节进行加工并用丝扣拼接。大管棚施工采用跟管钻进的方式,钻头采用220mm钻头,钻头与108钢管牢固连接用。同时,在大管棚施工前设置定位板,并在大管棚内设置止回阀以保证管棚的施工精度和注浆效果,提高施工效率。3、在管棚上方设置改良袖阀管,改良袖阀管采用φ42(外)×3.25mm(壁厚)钢管。在改良袖阀管施工前用Φ6~8mm小铝片粘“哥俩好”胶将注浆孔封盖,并用透明胶布粘牢,防止注浆管在施工作业时泥土进行管内注浆芯管无法进入。4、针对具体的工程项目,进行新型浅埋暗挖法施工技术方案的实施以及施工监测技术的研究。5、结合广州市轨道交通五号线淘金站新型浅埋暗挖法预加固技术实施过程,总结了施工经验,形成了国家级工法及相关专利成果,为类似工程提供借鉴。
[Abstract]:In recent years, with the development of urban rail transit in our country, subway engineering is increasing day by day. In urban underground engineering, the depth is generally shallow and the geological conditions are poor. More and more projects are constructed by the method of shallow excavation. In the process of construction, it is easy to cause large settlement of the surface, when the tunnel is near or passing through important building structures or underground pipelines. The allowable underground settlement is very strict, so the influence of construction must be strictly controlled in the construction process of shallow underground excavation. Pre-reinforcement technology is also one of the key processes to ensure the safety of shallow excavation construction. Based on the extensive investigation, this paper deeply studies the technical key points of shallow underground excavation construction, especially the pre-reinforcement technology of shallow underground excavation. This paper has completed the following research work: 1, expounded the characteristics of various shallow excavation pre-reinforcement technology measures, compared the construction technology, construction cost and construction effect of horizontal rotary grouting pile pre-reinforcement in detail. Pre-reinforcement technology of large pipe shed and pre-strengthening technology of grouting method; 2. According to the main points of pre-strengthening technology and grouting pre-strengthening technology, a new type of pre-reinforcement technology of large pipe shed is put forward: the pipe shed of large pipe shed adopts 蠁 108 pipe shed. The large pipe shed is processed according to 2.0m ~ 3.5m knots and spliced with wire buckle. The pipe shed construction adopts the way of pipe following drilling, and the drill bit adopts 220mm bit. The drill bit and 108 steel pipe are firmly connected. At the same time, the positioning plate is set up before the construction of the big pipe shed, and the check valve is installed in the large pipe shed to ensure the construction accuracy and grouting effect of the pipe shed and to improve the construction efficiency. 3. An improved sleeve valve pipe is arranged above the pipe shed. The improved sleeve valve pipe adopts 蠁 42 (outside) 脳 3.25mm (wall thickness) steel pipe. Before the improved sleeve valve pipe is constructed, the grouting hole is sealed with 桅 6 ~ (8) mm small aluminum sheet "two good" glue, and the grouting hole is cemented with transparent tape. In order to prevent grouting pipe from entering. 4, the new shallow excavation construction technical scheme and the construction monitoring technology are studied. Combined with the implementation process of the new type of shallow burying and digging pre-reinforcement technology in gold mining station of Guangzhou Rail Transit Line No. 5, the construction experience is summarized, and the national engineering method and related patent results are formed, which can be used for reference for similar projects.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4;U231.3

【引证文献】