This paper expatiates the construction process of double-walled steel cofferdam for the main bridge pier basis of Beijiang Bridge,include machining,transportation,immersion,cap end,and introduces mainly the force calculation of double-walled steel cofferdam anchorage system,providing reference for parameter selecting of force calculation in similar project.

Immersed tube method is a major construction method for underwater tunnels,of which the key techniques include prefabrication,towing,immersion and connection of tube elements,as well as foundation treatment.

Through engineering practice,the paper introduces the process of pipe floating,connection and immersion.

Submergence Model Test of Bucket Foundation Platform;

Based on current force calculation of varying current velocity distribution and static analysis of mooring lines, a new method of dynamic balance is proposed, which can make BFP to be vertical in submergence, and assure BFP to touch seabed in favorabl.

Bucket foundations platform is subjected to the complicated first order and second order hydrodynamic force in the stage of submergence.

Electrodeposit technology is more and more popular today because excellent performance layer can be made on the surface of inferior material by this technology, which can save costly alloy and rare metal as well as energy.

The key technique in large caisson construction of marine works is introducing precast concrete works off site,rolling method,floating and installation in this paper.