一种创新的码头结构新型式——整体箱板式高桩码头结构设计与施工技术

阐述了传统高桩码头结构在耐久性、整体性方面存在的主要问题,针对问题提出了几个新的设计理念,并据此设计了一个创新的码头结构方案.其要点是上部结构采用双向预应力整体箱板结构,桩基采用全直桩基础.上部结构沿码头纵向分段拼装,按短线匹配法箱梁预制施工技术进行设计,在纵向分段预制时形成横向无粘结预应力构件,预制的纵向分段在桩基上安装后,在预留的孔洞及管道中进行预应力张拉,形成纵向粘结预应力.在整体箱板与桩基连接处,采用三向预应力纤维混凝土.施工完成后,一个标准段码头的上部结构形成一个整体箱板.文中通过2个案例,从设计、施工、工程量及经济指标等方面论证了本方案的优越性及其推广应用价值.

An innovative scheme of new type wharf structure (The design and construction technique of a piled wharf with monolithic box-slab superstructure)

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.