Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Wave hindcast of sea crossing bridge and construction window analysis of driving pile ship
Ke Dong1,2,3, Zhao Luo1,2,3,*
CCCC Second Harbour Engineering Company LTD.,Wuhan, Hubei Province, China
2
Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure, Wuhan, Hubei
China3
Key Laboratory of Large-span Bridge Construction Technology, Wuhan, Hubei Province, China*Corresponding author
1ABSTRACT

There are surge waves at the site of the project. Most of the water depth
at the bridge site is more than 20m and the maximum water depth ismore than 65m. The project is also the deepest pile foundation bridge inthe world. There are 140 piers in the whole bridge. The approach bridge
have two kind of spans: 70m span and 100m span. The foundation formof the 70m span approach bridge is 4-pile foundation. The foundation
form of the 100m span approach bridge is 6-pile foundation. The total
number of piles on sea are 667. The longest steel casing pile is about
93m and the weigh 162t. The main bridge is a 205 + 450 + 205m cablestayed bridge structure. The concept picture of the bridge can been seenin Fig. 1. And the distribution of pier location and water depth of theproject can be seen in Fig. 2.

The water depth of sea-crossing bridge is normally more than 50m,
which cost too much to build trestle or fixed guide platform in
traditional construction method of river. Construction by ship ispreferred scheme in time and cost. However, another challenge is that
sea-crossing bridge faces rough sea state. Facing with rough sea state,roll and pitch of ship is too large to comply with strict quality
requirement. It is not easy to predict if the ship can construct, because it
needs accurate sea state, ship motion response, and motion limitation
requirement. The construction experience consider that the significant
wave height limitation is 0.5m for driving pile. However, the wave
limitation is different in different ship and wave period. And the spanof sea-crossing bridge is so long that different pier has different wave
state. The sea-cross length of Brazil Salvador-Itaparica Bridge is
12.4km. The monitor data shows that frequency less than 0.5m wave
height is about 57% in 2015, resulting in shorter construction period.
To get accurate wave state, wave data by month and pier for 5 years isfound based on third-generation wave numerical model. To find therelationship between ship and sea state, ship motion response isanalyzed by potential flow theory. To get the pitch or roll limitation, six
degrees of freedom is measured on ship on site. The research helps tochoose the driving ship which can meet construction window frequency
more than 80%.

Fig. 1 Distribution of pier location and water depth of the project

KEY WORDS: Sea crossing bridge; wave hindcast; ship motion
response; driving pile ship; construction window frequency.

INTRODUCTION
More and more sea-crossing bridges are built in deep-water surge seastate. Compared with inland river bridges, one of the biggest
construction challenge is drving pile under surge sea state. Under thelong period wave, even if the wave height is very small, it will have alarge roll of pitch motion, which will affect the operation accuracy andsafety.

Fig. 2 Distribution of pier location and water depth of the projectDue to the tight construction period, too many piles, long steel casing
pile and large pile weight of the project, the project plans to use the piledriving ship in avoid of the expensive engineering cost caused by thetrestle or fixed guided platform in deep water.

At present, there is no case of pile foundation construction of sea
crossing bridge with water depth of more than 60m. In the pilefoundation construction of bridge with water depth about 40m, ChinaMaldives Friendship Bridge drives pile with the help of fixed guide
platform to control accuracy.(Xi, 2017)

In the practice of civil construction management in Japan and theconstruction data of Taiwan Jinmen bridge project, both described that

The sea-cross length of Brazil Salvador-Itaparica Bridge is 12.4km.

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