Construction Technology of Integral Translation and UTurn
of Large Diameter Shield&nbsp;in
Narrow Space： a Case Study of Kanaphuli Tunnel in Bangladesh

Construction Technology of Integral Translation and UTurn of Large Diameter Shield

doi:10.3973/j.issn.2096-4498.2022.S1.054

2022 , Vol. 42 >Issue S1: 459 - 465

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.S1.054

Construction Technology of Integral Translation and UTurn of Large Diameter Shield in Narrow Space： a Case Study of Kanaphuli Tunnel in Bangladesh

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(1. CCCC Second Harbour Engineering Co., Ltd., Wuhan 430040, Hubei, China; 2. Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure, Wuhan 430040, Hubei, China;

3. Key Laboratory of Large-span Bridge Construction Technology, Wuhan 430040, Hubei, China 4. China Communications Second Navigational Bureau Third Engineering Co., Ltd., Zhenjiang 212021, Jiangsu, China; 5. China Road & Bridge Corporation, Beijing 100011, China）

Online published: 2022-08-23

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Abstract

In the narrow working shaft space of overseas projects, problems always occur during the transition process of largediameter shield, including tight construction schedule, lack of professional technical personnel, and largescale disassembly and assembly equipment. The construction technology of integral translation and Uturn of the largediameter shield in narrow space is studied by taking the tunnel under the Karnapuhli river in Bangladesh bored by a shield as an example. The results show that: by adopting a new type of steel ball base designed independently as the walking medium and supplemented by the laying of the bottom plate of the working shaft, the sliding friction between the steel sleeve integrated bracket and the bottom plate of the working well can be converted into rolling friction, greatly reducing the translation and rotation resistance. Furthermore, combined with the shield slope adjustment system design, the technology can achieve highprecision asynchronous coordinated slope adjustment, staged longdistance translation, and insitu 180° rotation of the largediameter shield in narrow working shaft space, providing reference and experience for similar projects in the future.

Key words： narrow space; large diameter shield; asynchronous cooperative slope adjustment; translation; rotation

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Construction Technology of Integral Translation and UTurn of Large Diameter Shield .

Construction Technology of Integral Translation and UTurn of Large Diameter Shield in Narrow Space： a Case Study of Kanaphuli Tunnel in Bangladesh

[J]. Tunnel Construction, 2022 , 42(S1) : 459 -465 . DOI: 10.3973/j.issn.2096-4498.2022.S1.054

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