Abstract:
The study presents a number of main problems on the durability and monolithic character waiting to be solved in customary high-piled beam-slab wharf scheme. Aiming at these problems, the authors propose some new design concepts, and suggest an innovative scheme of new type wharf superstructure. The main points of the new scheme are as follows. Dual directional prestressed concrete box-slab is used as the superstructure and all vertical piles are used for the pile foundation of the wharf. The superstructure divides in several segments along the longitudinal direction of the wharf while precast and put together as a whole in site. The box-slab segments are designed by the method using matching precasting technique. Bondless prestressed technique is used in precasting the longitudinal segment. After all these segments of a whole wharf section are put together in site, steel wires will pass through the remaining holes in the segment during precasting. After stretching the steel wires to the designed stress and bonded them tightly, these holes will be full with cement mortar and thus the wharf section will be prestressed along the longitudinal direction in whole. Between the segments, special adhesive agent is used to bond them together, and enough pressure is given to ensure full solidification of the adhesive agent by stretching short steel bars, which are prepared beforehand. At the connecting joints of the box-slab and pile foundation, three directional prestressed fiber concrete can be used. Thus, after construction, the superstructure of a wharf section will be integrated as a whole. Two construction cases of the wharf structure are introduced. Through the analysis and comparison between them, it clearly illustrates the superiority and promising applications of the new scheme in the aspect of design, construction, work amount, and economic indicator, etc.