On the basis of load age of con crete this paper presents the creep equation of concrete and analyses the effcet of reinforced skeleton frame on creep of concrete in accordance with deformation between concrete and reinforced skeleton frame by means of finite-element method.

From base plate setting,dismantling formwork,fabrication of steel cable and framework of steel reinforcement,concrete work and other aspects the construction technology of box beam is introduced;at the same time matters needing attention in construction are pointed out.

Introduced the method and preparation of construction by engineering example,we must abide the operation and adapt measures in order to assure the quality of bored concrete pile,and also introduced the method and requirements of reinforcement cages and grouting of underwater concrete pile.