Concreting Sequence without Support for Steel-Shell-Concrete Immersed Tube of Shenzhen-Zhongshan Link Based on Segmental Deformation Control

doi:10.3973/j.issn.2096-4498.2021.12.011

Tunnel Construction ›› 2021, Vol. 41 ›› Issue (12): 2106-2112.DOI: 10.3973/j.issn.2096-4498.2021.12.011

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Concreting Sequence without Support for Steel-Shell-Concrete Immersed Tube of Shenzhen-Zhongshan Link Based on Segmental Deformation Control

SUN Wenhuo^{1, 2, 3}, LIU Meimei^{1, 2, 3}, JI Ting⁴

(1. CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, Guangdong, China; 2. Key Laboratory of Hydraulic Structure Durability Technology for Transportation Industry, Guangzhou 510230, Guangdong, China; 3. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, Guangdong, China; 4. The Second Engineering Company of CCCC Fourth Harbor Engineering Co., Ltd., Guangzhou 510230, Guangdong, China)

Online:2021-12-20 Published:2022-01-05

Abstract

Abstract: To realize high-precision and high-efficiency prefabrication of steel-shell-concrete immersed tubes for the Shenzhen-Zhongshan link (hereinafter the Shenzhong link), the cell-type concreting sequence without support is studied. First, the simulation calculation methods for steel-shell-concrete immersed tubes under the combined action of time-varying strength, shrinkage, creep, hydration heat, and deadweight of concrete are investigated. Second, the influence of the temperature field of concrete hydration heat on tube deformation is analyzed. Finally, the influence of cell-type concreting sequence with and without a support system on the deformation of immersed tubes is analyzed and the optimum concreting sequence is chosen. The results show the following: (1) the hydration heat of concrete has a limited influence on the final deformation of tubes; (2) the ceu-type and hopping concreting technology is the optimum considering the pouring efficiency of the intelligent trolley and deformation control; and (3) the support system can be canceled as it has a negligible influence on the deformation of the top plate.

Key words: steel-shell-concrete immersed tube, segmental deformation control, support system, hydration heat, cell-type concreting

CLC Number:

U 455

SUN Wenhuo, LIU Meimei, JI Ting. Concreting Sequence without Support for Steel-Shell-Concrete Immersed Tube of Shenzhen-Zhongshan Link Based on Segmental Deformation Control[J]. Tunnel Construction, 2021, 41(12): 2106-2112.

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Concreting Sequence without Support for Steel-Shell-Concrete Immersed Tube of Shenzhen-Zhongshan Link Based on Segmental Deformation Control

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