
76
DOI:10.7672/sgjs2016110076
施工技术
CONSTRUCTION TECHNOLOGY
2016年6月上第45卷第11期
地铁盾构钢套筒接收施工技术方案研究*
李文,袁天海郭谱2
(1.武汉市车都轨道交通有限公司,湖北武汉430056;2.华中科技大学土木工程与力学学院,湖北武汉430074)【摘要】地铁工程盾构接收过程是难度最大、风险最高的环节,由于城市地铁盾构隧道施工地质条件及周边环境复杂,盾构到达接收过程中易发生漏水、涌砂等风险,为确保盾构出洞安全,故选取适当的盾构接收方法便显得尤为重要。以某地铁区间隧道的实际施工情况为背景,针对高承压水地区易发生浦水、涌砂等风险,从工期情况和施工风险两方面分析盾构接收方案,最后采用系墙+钢套筒+辅助降水接收方案。该方案解决了由于前期高压旋喷加
有效地避免盾构到达接收过程中漏水、涌砂等风险,确保出洞安全。【关键词]地铁;盾构;辅助接收;端头加固;钢套筒;施工技术
[中图分类号】U455.43
【文献标识码]A
[文章编号】1002-8498(2016)11-0076-04
StudyonReceivingConstructionSchemeofSteelSleeveofSubwayShield
Li Wen',Yuan Tianhai’,Guo Pu?
(1. Wuhan Auto-city Tram Transportation Co. ,Ld. , Wuhan,Hubei 430056, China; 2. School of Ciril Engineering
& Mechanics, Huazhong Unirersity of Science and Technology, Wuhan, Hubei430074, China)
Abstract: The receiving process of subway shield project is the most difficult, highest risk field, since complex geological conditions and the surrounding environment of the city subway shield tunneling, water leakage and sand gushing risk easily occurs in shield reaching the receiving process, in order to ensure the shield hole security, so selecting the appropriate method of shield is particularly important. In this paper, based on actual construction of a subway tunnel, this paper analyzes shield receiving scheme from two aspects of risk analysis and construction, finally, the scheme with plain steel sleeve + wall + auxiliary precipitation reception is used. The scheme solves some difficult problems,including the solution that the diaphragm wall trenching is slow in the high pressure jet grouting reinforcement, and the gap existing between the main maintenance structure and diaphragm wall. The results show that the scheme effectively avoids water leakage in shield reaching the receiving process and sand gushing risk, which ensures security hole.
Key words : subways ; shields ; auxiliary receive ; tip reinforcement ; steel sleeve ; constructior
引言 0
在地铁工程盾构法区间隧道施工中,始发和接
收过程是整个工程中的关键工序,也是难度最大、风险最高的环节,尤其是盾构接收过程尤为明显。当到达端头地层条件较差时,对于盾构到达的安全措施.传统工艺主要采用端头加固处理13],还有水中到达法[4]、深井到达法[5]、冻结法[6]等。由于以上工法均要求对洞门端头进行各种施工,而且加固质量难以保证,仍存在较大风险。在此背景下,某
*国家自然科学基金项目(51408245)
【作者简介]李文,高级工程师,E-mail:236462356@qq.eom【收稿日期]2016-02-24
地铁区间盾构法隧道施工遇到的特殊工程地质条件,采用钢套筒辅助工艺接收方案比选解决了施工难题,确保了盾构到达安全,不仅丰富了传统到达施工工艺的内容,更提高了盾构到达风险控制的安
全性,有效将盾构到达风险降至可控范围。 1工程概况
1.1地理位置及周边环境
某地铁区间位于某地解放大道与建设大道交叉路口以南的建一路下。接收端车站南侧距离江汉二桥约450m,距离汶江650m。东北侧为现有1 号线高架桥,距离接收井28m,桩长42m,高架桩为摩擦桩,桩端位于粉细砂层中。西侧紧邻二环线高