Abstract:Ductile cast iron integrated anchorage anchorage system is a special anchorage developed for non-bonded prestressing tendons on the basis of summarizing the application of prestressing tendon anchorage in the past 20 years in China, which is characterized by the use of ductile cast iron in the tension end of the anchorage will be the integration of the pad plate and the anchor ring, the amount of material is low, the structure is compact, and the anchorage is reliable; the fixed end of the anchorage is designed as a friction piece extruded anchors, the production of extrusion anchors is convenient, and the anchorage is more reliable, and the performance meets the relevant requirements of national standard GBT143702000, and also applies to 2000MPa level prestressing tendons. Its performance meets the requirements of GB/T14370-2000, and it is also suitable for 2000MPa prestressing tendons. In addition, the biggest feature of this anchoring system is that it can realize the full-length closure of prestressing tendons.

Abstract:In vitro prestressing technology is one of the main branches of post-tensioning prestressing system. In this paper, a comparative study of strain test and finite element analysis of extracorporeal anchorage system, static load and fatigue test of assemblies, and test study of extracorporeal bending ropes are carried out. The engineering design and construction examples show that this technology can be applied in the strengthening of long-span bridges, roofs and existing structures.

Abstract:Anchoring technology has developed rapidly and is widely used in various industries for engineering reinforcement. In order to adapt to the engineering needs, at present, hydropower, water conservancy, national defense, coal and other systems have promulgated their own anchor, anchor cable specification. Recently in the anchoring technology there are still many controversial and worth exploring the issue, this paper on the recent promulgation of "geotechnical anchors (ropes) technical regulations" (CECS22: 2005) in some of the technical provisions of the different views, in order to facilitate the readers to understand our point of view, in the provisions of the regulations is not appropriate at the same time, detailed reasons, and puts forward our point of view!

Abstract:In this paper, the loss of anchor locking tension of pressure-dispersed and tension-dispersed anchor cables, and the loss of prestressing force of anchor cables due to creep of slope geotechnical bodies are explained and discussed.

Abstract:In this paper, representative methods for calculating the ultimate stress of extracorporeal prestressing tendons at home and abroad are firstly reviewed. On this basis, a formula for calculating the ultimate stress of extracorporeal prestressing tendons in the design of new and strengthened bridges is proposed. The formula is simple, intuitive, and applicable to both simply supported and continuous beams. Since the modulus of elasticity of prestressing tendons is included in the formula, the proposed formula can also be used for the extracorporeal prestressing structures made of non-steel materials.

Abstract:Prestressing technology has been applied in many bridge projects. With the large-scale construction of highways, there are many bridges of different types, and the quality accidents and cracks that occur with them are also increasing. This paper addresses the early strength of concrete in prestressed bridge construction, the quality of the reserved aperture, the super-long bunch of one end of the tensioning process, the application of flat anchors, the size of the clip-type anchorage and the length of the clip is reduced in an orderly manner and affects the quality of the anchorage and other issues, through a number of accidents, the authors did a large number of investigations and analyses of a number of pre-stressing technology occurring in the construction of questioned!

Abstract:In this paper, through the force analysis, analyzed the current market use of 5-hole flat anchor problems, and to the quality of the project brought about by the hidden danger, and put forward the improvement of opinions

Abstract:In view of the engineering characteristics of Nanchang Shengmi Bridge and the structure and use of parallel steel wire cable, this paper describes the production, transportation, installation, tensioning and other construction processes of the special tether cable of the Shengmi Bridge, which is of certain reference value for the design and construction of similar extracorporeal prestressing projects.

Abstract:This article is extracted from the Hangzhou Bay Bridge design, construction and bidding information and add some of the author's insights.