Abstract:China's prestressed projects into the international market is increasing day by day, the international prestressed industry on the structure of the prestressed anchorage zone bearing performance have standard requirements, China's research in this area is just a weak point. The cast anchor plate and the spiral bar are part of the clip-on anchor, and the International Prestressing Association (FIP), the European Standards (EN) and Technical Certification Organization (EOTA), the American National Highway and Transportation Association (AASHTO) and the Post-Tensioning Institute (PTI) all require test certification combined with the arrangement of the anchor on the structure, and the approved product is allowed in the construction On the practical. China's upcoming revision of the anchor standard, there will be comparable provisions. China's prestressed anchor production industry, structural design units and project owners and other departments will soon face this complex and strict unfamiliar test. In this paper, as the sixth part of safety discussion in anchoring area, a preliminary introduction is made to the test methods explored by Hangzhou Zheanchou Prestressing Co., Ltd. in the past three years, in order to respond to the implementation of China's new anchor standard and carry out the test recognition work. Technical immaturity is inevitable, throw a brick to attract jade, willing to discuss with peer experts.

Abstract:The installation of the support is an important link in bridge construction. How to ensure that no deviation occurs during the design of the closing temperature after the installation of the support? Taking the installation of the steel box beam support in the Hong Kong-Zhuhai-Macao project as an example, a new vibration isolation rubber support pre-deflection device has been applied in the project. The advantages of the device are small structure, light weight, high precision and strong applicability, no need for external structure as a reaction support, the support itself is a reaction, with easy operation, no damage to the bridge and the support and other advantages.

Abstract:Yinghua Bridge in Nanning City is a three-span continuous steel box girder suspension bridge with double towers and single cable slings. The process of cable clamp test of the bridge is described briefly. The diameter and void ratio of the main cable are verified by tight cable test. The mechanical properties and skid resistance of the cable clamp are verified through the mechanical properties test and skid resistance test of the cable clamp.

Abstract:Under the action of high density crowd walking force, the boarding bridge may produce large vibration, which will cause the discomfort of pedestrians and even cause panic among the crowd. According to the use of eddy current TMD to control the vertical vibration of the boarding bridge in the new terminal of Nanning Wuwei International Airport, the damping of the whole structure and the acceleration response of the structure under crowd excitation are improved.

Abstract:Engineering accidents often occur due to the anchorage force loss of prestressed anchor cables leading to anchorage failure. There is a complex coupling effect relationship between the anchorage force loss of anchor cables and the creep of rock and soil mass. Through theoretical analysis and model research, a coupling effect calculation model based on strain equality is established on the basis of the common rheological model of rock and soil mass, and the model is verified. The coupling effect model between the two is established, and the calculation relationship between the two is established, which provides the theoretical basis and technical means for the design, construction, safe operation management and the control and compensation technology of the anchoring force loss of the prestressed anchorage engineering.

Abstract:This paper introduces the design and application of a special anchoring device, which can move on a circular track, in the cable network erection project of the main supporting structure of the active reflector of the radio telescope FAST at Guizhou Observatory. The mobile trolley is the anchoring device of the cable network erection works on the ring beam. It is used to anchor the construction cableway (hanging cableway and basket cableway) and the tension end reaction frame of the steel strand pulling the radial cable, while the other end of them is anchored on the tower and the catway V-shaped platform in the center of the ring beam. The mobile platform car is effectively fixed on the ring beam with a fixed device, and the flat truss structure is small in size and light in weight, which is conducive to the effective transfer of its own cable force to the ring beam, and greatly improve its own stress condition. The platform is equipped with a slope track to allow the cable car to pass through it, ensuring the safety of cross-dimensional operation.

Abstract:At present, the middle arch bridge is a common urban landscape bridge. Taking Ziyang Tuojiang Bridge as an example, this paper focuses on the construction technology of gradually tensioning and dismantling of the upstream N1# and downstream N2# tie rods, and the construction technology of installing the upstream N1# and downstream N2# tie rods. Some problems in the construction of these processes are discussed.

Abstract:Pasting steel plate is a common reinforcement method in bridge reinforcement. Taking the pasting steel plate on the beam of Fuding Shanqian Bridge as an example, the paper introduces the construction technology of pasting steel plate on the bottom of the beam of Fuding Shanqian Bridge - pouring method pasting large area steel plate technology, which effectively avoids the problem of too many construction personnel and material waste in conventional construction methods, and at the same time ensures the quality of pasting steel plate on the bottom of the beam.

Abstract:A new type of bridge called the Butterfly Web Bridge is being built in Japan, the Takubo Kawabashi Bridge. The bridge is a highway bridge with a total span of 10, of which the largest span is 87.5m. The butterfly web structure is a butterfly shaped prefabricated plate with a thickness of 150mm at the box girder web. The web is composed of concrete with a strength of 80MPa, and the tensile stress area is reinforced by a single prestressed bar. In addition, the 150mm thick web is reinforced with steel fibers instead of steel bars. The bridge was constructed using the free cantilever method. The butterfly web is prefabricated in the concrete plant and weighs 3.3t. This makes the construction weight of the main girder lighter than that of ordinary concrete web box girder. As a result, the cantilever construction is about 50% faster than the traditional pouring in situ method.