市政排水隧道被钻机侵入破损后的修复方法
2021-11-27张磊
张磊



DOI:10.16661/j.cnki.1672-3791.2109-5042-9179
摘 要:市政排水隧道为关系国计民生的百年工程,结构安全尤其重要。主体结构因某些原因遭到局部破坏后的修复工作,必须通过科学论证、精细施工才能确保修复后的结构满足使用需求。该文结合斯里兰卡排水隧道被地面钻孔非法侵入后的现状,进行了破损隧道位置的受力分析。综合考虑隧道结构安全和施工可行性等因素,最终确定隧道修复方法,为今后类似施工提供一定借鉴和帮助作用。
关键词:盾构 管片 排水 隧道 破损 修复
中图分类号:K826.16 文献标识码:A文章编号:1672-3791(2021)09(a)-0064-05
Repair Method for Municipal Drainage Tunnel Invaded and Damaged by Drilling Rig
ZHANG Lei
(China Petroleum Pipeline Engineering Co., Ltd., Langfang, Hebei Province, 075000 China)
Abstract: Municipal drainage tunnel is a century old project related to the national economy and the people's livelihood, and structural safety is particularly important. After the main structure is partially damaged for some reasons, the repair work must be carried out through scientific demonstration and fine construction to ensure that the repaired structure can meet the needs of use. Combined with the current situation of drainage tunnels illegally invaded by ground drilling in Sri Lanka, the stress analysis of damaged tunnel position is carried out in this paper. Considering the factors such as tunnel structure safety and construction feasibility, the tunnel repair method is finally determined to provide certain reference and help for similar construction in the future.
Key Words: Shield; Segment; Drainage; Tunnel; Damage; Repair
現代城市内的排水管道施工,越来越多地采用非开挖工法,如顶管法、盾构法等。随着城市化率的不断提高,大批市政工程集中建设,在地面钻孔勘察、桩基施工过程中稍有不慎就可能对既有地下排水管道造成破坏。
该文就以斯里兰卡某新建排水隧道的管片结构受地面钻机侵入破坏后修复的工程实例,对隧道破损修复方法进行探讨,以此为类似问题提供解决方案。
1 概况
该隧道位于该国首都科伦坡,为市政主排水通道,采用盾构法施工,全长780 m,混凝土管片衬砌结构,内径3 m,环宽1 m,壁厚0.25 m,混凝土等级C50。
隧道完工移交前,因地面居民在钻探施工时,非法将隧道管片结构钻通,造成地层水土大量涌入,危及隧道和地面房屋安全。
该破损点位于管片端部,隧道排水方向右侧2点至3点位置,钻孔直径127 mm,隧道内表面破损范围730 mm×300 mm。管片内部分钢筋被切断,管片螺栓变形。另外,破损点位于管片B2块边缘,且钻孔贯穿管环外侧边缘,造成管片密封条局部出现断裂、失效。……
