改进全圆针梁台车在前坪水库衬砌工程的应用
2020-10-12罗福生郝二峰皇甫泽华王磊胡玲玲
罗福生 郝二峰 皇甫泽华 王磊 胡玲玲



摘 要:基于前坪水库输水洞洞身混凝土衬砌工程,分析全圆针梁台车的组成、受力、台车组装、运行,对其进行改进后应用于前坪水库输水洞洞身衬砌工程中。通过对全圆针梁台车进行技术改进,增加全圆针梁台车辅助振捣孔,施工人员在台车内采用插入式振捣器进行辅助振捣,解决了小断面洞型衬砌施工时人员无法进入仓内进行混凝土振捣的问题,为小断面洞型混凝土衬砌施工质量提供有力保障,同时为提高小断面洞型衬砌的混凝土质量积累了施工经验。
关键词:输水洞;混凝土衬砌;混凝土振捣;针梁台车;改进与应用
中图分类号:TV672+.1文献标志码:A
doi:10.3969/j.issn.1000-1379.2020.06.031
Application of Improved Full Circle Needle Beam Trolley in Small Section Tunnel Lining of Qianping Reservoir
LUO Fusheng1, HAO Erfeng1, HUANGFU Zehua2, WANG Lei1, HU Lingling1
(1.Second Engineering Bureau of Henan Water Conservancy, Zhengzhou 450016, China;
2.Construction and Management Bureau of Henan Qianping Reservoir, Zhengzhou 450003, China)
Abstract: Based on the concrete lining project of the tunnel body of Qianping Reservoir, this paper introduced in detail the composition, stress analysis, trolley assembly, operation and improvement and application of the trolley with full-circle needle beam in the lining of the tunnel body of Qianping Reservoir. Through technical improvement of the trolley with full-circle needle beam, the auxiliary trolley with full-circle needle beam was added. The construction workers used plug-in vibrator as auxiliary vibration to solve the issue of difficult concrete vibration in a small area of small section tunnel lining construction, providing strong support for the quality of small section tunnel lining construction and accumulating construction experience for increasing the concrete quality of small section tunnel lining of similar projects.
Key words: delivery tunnel; concrete lining; concrete vibration; needle beam platform car; application
混凝土振搗是影响混凝土浇筑质量的重要工序,振捣方式直接影响混凝土的密实度、实体质量与外观质量。小断面洞型衬砌施工中混凝土振捣是难点,在类似工程施工中[1-3]混凝土的振捣通过悬挂在模板外壁上的附着式振捣器进行,如振捣器振捣时间过长,则会增大台车位移的风险,如振捣器振捣时间过短,则会增大混凝土振捣不密实的风险,混凝土的实体质量与外观质量难以保证。全圆针梁台车在隧洞衬砌工程中应用广泛[4-6]。笔者基于对全圆针梁台车的构成、行走系统、工作原理以及混凝土浇筑顺序等的分析,对台车进行改造,增加混凝土振捣孔及观察孔,在混凝土浇筑时,通过增加的振捣孔采用插入式振捣器进行辅助振捣,确保混凝土振捣密实,同时减少附着式振捣器的振捣时间,从而降低模板台车位移的风险,确保混凝土浇筑的实体质量与外观质量。……
