Abstract
The Xihoumen Rail-cum-Road Bridge is a hybrid cable-stayed-suspension bridge with a main span of 1 488 m. The foundation of Pier No.4 is an embedded caisson foundation. The caisson has a diameter of 58 m and a height of 37 m and was constructed using the floating transportation method. The total floating-transport mass of the steel structure and appurtenances was approximately 9 870 t. To address the insufficient horizontal positioning stiffness, construction difficulty, and high cost associated with the positioning-vessel and anchor-pier methods in a deep-water, bare-rock environment, this paper adopted a large-tonnage gravity-anchor positioning method to optimize the caisson positioning system. Five anchor-cable systems with different structural configurations were designed. The finite element method was then used to analyze key parameters, including the maximum cable force, displacement, and inclination angle, for each system under six typical construction conditions and to clarify how the mechanical behavior of the different anchor-cable systems varied and affected the positioning system. The results show that the anchor-cable system with double-layer main cables and single-layer side cables (Scheme 5) has no obvious advantage. For the single-layer anchor-cable systems (Schemes 1-4), lowering the upper anchor point is relatively beneficial for controlling the cable force and displacement of the caisson. From the perspective of construction control, the scheme with the upper anchor point located at approximately half the height of the caisson (Scheme 4) is the most advantageous. Given that all five anchor-cable systems meet the design requirements, the single-layer system with the upper anchor point at the top of the caisson (Scheme 1) is ultimately recommended based on a comprehensive comparison that considers cost control and construction difficulty.
Publication Date
8-16-2026
DOI
10.14048/j.issn.1671-2579.2026.04.019
First Page
178
Last Page
185
Submission Date
August 2026
Recommended Citation
Ning, Liu and Zhuhua, Yan
(2026)
"Design of positioning system for large floating caisson in deep-water bare-rock environment,"
Journal of China & Foreign Highway: Vol. 46:
Iss.
4, Article 19.
DOI: 10.14048/j.issn.1671-2579.2026.04.019
Available at:
https://zwgl1980.csust.edu.cn/journal/vol46/iss4/19
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