超大直径泥水盾构水中接收关键技术研究——以汕头海湾隧道为例  

Key Technologies for Underwater Receiving of Super Large Diameter Slurry Shield——Taking Shantou Bay Tunnel as an Example

作　　者：陈林 秦银平 张文新 高会中 王发民 CHEN Lin;QIN Yinping;ZHANG Wenxin;GAO Huizhong;WANG Famin(China Railway Tunnel Group,Guangzhou 511458,China;State Key Laboratory of Shield Machine and Boring Technology,Zhengzhou 450001,China)

机构地区：[1]中铁隧道局集团有限公司,广州511458 [2]盾构及掘进技术国家重点实验室,郑州450001

出　　处：《铁道标准设计》2024年第8期130-136,共7页Railway Standard Design

基　　金：国家重点研发计划项目(2020YFB2007201);中铁隧道局集团有限公司科技创新计划项目(隧研合2020-10,隧研合2022-11)。

摘　　要：为解决超大直径泥水盾构在临海富水淤泥、砂层接收洞门的涌水、涌砂、涌泥地层存在的技术难题,以汕头海湾隧道工程超大直径泥水盾构在富水地层采用的接收关键技术为例,分析超大直径与小直径盾构水中接收的区别。基于超大直径盾构接收流程,阐述了超大直径泥水盾构在接收工作中端头加固、接收井封堵墙施工、接收基座施工、单层玻璃纤维筋洞门破除、贯通测量、接收掘进与注浆、洞门封堵等方面的解决方法,从盾构姿态控制、掘进参数控制、注浆控制、管片复紧、洞门临时封堵几个方面对超大直径盾构接收关键技术进行分析;通过采用设置砂浆接收基座为盾构接收提供足够的反力,保证盾构机出洞安全;借助同步注浆和二次注浆封闭补强质量,加强管片复紧,确保盾构隧道结构强度稳定;在最后5环使用多孔特殊环管片,提高注浆效果。然后,通过排水清砂并从上及下逐次施作钢筋骨架加喷射混凝土封堵洞门、降低无封堵洞门暴露时间、确保洞门施工安全等措施,保障水中接收的安全性。In order to solve the technical problems of the super-diameter slurry shield in the waterinrush,sand-bursting and mud-bursting strata at the entrance of the receiving tunnel in the water-rich silt and sand strata near the sea,the differences between the super-diameter and the small-diameter shield in the underwater reception are analyzed by taking the key receiving technology of the super-diameter slurry shield in the water-rich strata of the Shantou Bay Tunnel Project as an example.Based on the receiving process of super-large diameter shield,this paper expounds the solution methods of super-large diameter slurry shield in the aspects of end reinforcement,receiving shaft plugging wall construction,receiving base construction,single-layer glass fiber reinforced concrete tunnel door breaking,penetration measurement,receiving tunneling and grouting,tunnel door plugging,etc.,including shield posture control,tunneling parameter control,grouting control,segment re-tightening The key technologies of the super-large diameter shield receiving are analyzed from several aspects of the temporary plugging of the tunnel portal.The mortar receiving base is set to provide sufficient reaction force for the shield receiving to ensure the safety of the shield tunneling.The synchronous grouting and secondary grouting closing is employed to improve the reinforcement quality,strengthen the segment re-tightening and ensure the stability of the shield tunnel structure strength.For the last five rings,special perforated ring segments are used to improve the grouting effect.Then,the drainage and sand removal is carried out,and the reinforcement framework and shotcrete are constructed from top to bottom to block the tunnel door,reduce the exposure time of the tunnel door without blocking,ensure the construction safety of the tunnel door,and other measures are taken to ensure the safety of the underwater reception.

关 键 词：海底隧道 超大直径泥水盾构 接收流程 端头加固 关键技术 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] U455.49[交通运输工程—道路与铁道工程]