北京地铁17号线朝十区间盾尾刷更换技术研究

The replacement of shield tail brushes for Chaoyang section of Beijing metro line 17

对北京地铁17号线朝阳港站-十里河站区间的盾尾刷更换原因和施工风险进行了分析,给出了风险应对措施;详细介绍了该工法的施工工艺、施工参数和主要应急措施等。以北京地铁17号线朝阳港站-十里河站区间左线盾构机更换盾尾刷为工程背景,介绍了一种盾尾刷更换的施工方法,该方法在盾构机掘进至更换盾尾刷位置时,通过盾体和管片上的注浆孔先后向盾尾、土仓和盾体四周注高粘度膨润土及注聚氨酯,并施做了止水环箍;之后打开管片更换盾尾刷并涂盾尾油脂,管片拼装后盾构机恢复掘进。该工法在实际工程中得到了成功应用,取得了很好的实施效果,可为今后类似工程提供技术参考依据。

Analyzed the reasons for the replacement of the shield tail brush and construction risks in the section between Chaoyang Port Station and Shilihe Station of Beijing Metro Line 17,and provided risk countermeasures;the construction technology,construction parameters and main emergency measures of this construction method are introduced in detail.Taking the replacement of the shield tail brush of the shield machine on the left line of the Chaoyanggang Station-Shilihe Station section of Beijing Metro Line 17 as the engineering background,a construction method of shield tail brush replacement is introduced.In this method,when the shield machine is tunneling to the position of replacing the shield tail brush,inject high-viscosity bentonite and polyurethane through the grouting holes on the shield body and the segments of the shield body,the soil bunker and the surroundings of the shield body,and make a water stop ring;then open the segment to replace the shield tail brush The shield tail grease is applied and the shield machine resumes driving after assembling the segments.The construction method has been successfully applied in actual projects and achieved good implementation results,which can provide technical reference for similar projects in the future.