Xianing port water conservancy project structure first expansion method pretressing force board construction technology 霞凝港水工结构先张法预应力空心板施工技术
Caller : i would like to book a flight to paris on january 8 on air france , first class and roundtrip 我要预订一张法航元月八号飞往巴黎的航班，要头等舱带返程的机票。
This paper analyses the problem of the theoretic elongation of post - tensioned steel strand of parabola - shape 摘要分析了后张法预应力抛物线形钢绞线理论伸长值计算问题。
Integral method of the prestressing and the prestress releasing for the pre - tensioned concrete members by way of tie - rod system 用拉杆系统进行先张法构件的整体张拉放张工艺
The traditional methods of ground improvement such as cement soil piles have shortages of low strength and short treating depth . to further reduce the discrepancy settlement , we can use the ptc prestressed pipe pile which has higher strength and treating depth 传统水泥土搅拌桩法在处理深厚软基中存在处理深度浅、强度低等缺陷，为了进一步减小新老路基间的差异沉降，推荐采用强度高、处理深度大的ptc型先张法预应力管桩进行替代。
The current approaches including code methods to calculate stress losses due to anchorage set exist several shortcoming , such as unsuitable to different profiles of tendons or very complicated to compute due to sectional analysis . based on classical theory of friction when tendons are stretched in post - tensioned concrete members , the unified method to calculate the stress losses in tendons due to anchorage set while considering the affection of reverse friction has been established , these formulae are suitable to be used in computer ; also approximate formulae are produced which are suitable to manual computation , they are easy to be applied in research or design 针对目前预应力钢筋锚固时钢筋回缩引起的预应力损失计算方法中存在的问题，建立了考虑反摩阻影响的后张法预应力混凝土桥梁锚固损失的统一计算式，适用于任意形状的预应力钢筋和单、双端张拉的情形；给出了适于机算的理论公式和适于手算的近似计算式，可方便地应用于研究和工程实践。
The detail procedures of the loading test on the ultimate bearing capacity under different load cases and the author ' s first - hand experience during the tests are documented in the paper . based on the experimental performance , it has been verified that the superposed floor assembled by the precast - prestressed sandwich slab working under the design and the reliability of the lateral connecting character of the slab 在板侧缝内施加后张法无粘结预应力，在构造上利用板侧伸出的钢筋相互搭接实现横向传力，变单向受力为双向受力形成装配整体式楼盖结构，可明显改善楼盖结构的受力性能。
This product is mainly used for prestressed and post - tensioning technology in large , medium and small sizes of various of pc structures , and widely used for civil engineering construction of large scale railroad , high - way bridges , buildings , truesses , overhead crane beams , industrial and civil prefabricated concrete floor , wall board , trbular piles , power line poles , power line poles , pc water pipes , tv towers and nuclear power station , etc 主要用于制作先、后张法的大、中、小型各种结构形状的预应力混凝土构件，如铁路、公路、屋架、吊车梁、工业民用预制板、墙板、管桩、电杆和预应力混凝土水管、电视塔、核电站等工程建设上。
Especially the bridge engineering has to be concerned with high , new and difficult technologies . new technologies firstly adopted are post - tensioned prestressed concrete simply - supported box girder , assembly two - way prestressed concrete simply - supported t - girder , reinforced concrete continuous rigid frame , and steel - concrete composite continuous girder . all these have formed a series of new bridge structures taking prestressed concrete simply - supported box girder as main feature 由于秦沈客运专线的特殊技术要求，在铁路建设史上首次采用了后张法预应力混凝土箱形简支梁、装配式双向预应力混凝土t形简支梁、钢筋混凝土刚构连续梁、钢与混凝土结合连续梁等桥跨结构，形成了以预应力简支箱梁桥跨结构为主要特征的一系列桥梁新结构。
