Abstract:The main channel bridge of Donghai Bridge is a five-span continuous two-tower central cable plane cable-stayed bridge with a main span of 420m. The main beam is the steel-concrete box combination beam first used in the long-span cable-stayed bridge. The overall design of the bridge is introduced.

Abstract:This paper introduces the design concept and method of two-way tensioned space grid structure of National Stadium. For example, the layout of new structures, the fire prevention calculation of large-span space structures, the analysis of the prevention of continuous collapse, the study of the prestress characteristics of two-way cables, the construction method of cumulative slip along the short-direction cable, and the monitoring and test situation.

Abstract:The main bridge of Fumin Bridge in Tianjin is a single-tower space cable plane self-anchored suspension bridge with unique shape and complex structural stress and construction treatment. The structural design features of the bridge are introduced, and the results of spatial analysis and calculation of the whole structure are described briefly.

Abstract:In the past 20 years, the prestressed technology has developed rapidly in the bridge engineering in our country, and the prestressed anchoring technology is becoming more and more mature. The analysis of the diseases under prestressed anchors shows that the causes of the diseases mainly include two aspects: one is the lack of mandatory load transfer performance test standards under anchors; The second is that the manufacturing specification of anchor gear is not perfect. Based on the severity and universality of anchor diseases, it is suggested to establish a more perfect national standard for the performance index of anchor products.

Abstract:Based on the reinforcement project of Nandu Bridge, the paper analyzes the main diseases (including concrete carbonization, steel rust expansion, concrete defects, etc.) affecting the reduction of the bearing capacity of the main arch circle and their causes. In order to improve the bearing capacity of the original main arch circle to meet the current traffic needs, the strengthening technology of the main arch circle is adopted to increase the cross-section of the main arch circle To provide reference for similar engineering design and construction.

Abstract:Parallel steel strand cable-stayed bridge before and after the bridge is generally a single tensile long-term fixed repetitive pulling 1, 5, 10... The method of testing the cable force of the steel strand, often pulling will increase the bite mark displacement of the tensioning end clip and the possibility of sliding wire, which will affect the safety of the stay cable. The flat integral cable force detection method is adopted, which does not loosen the clip, improves the test efficiency and accuracy, and increases the safety of the cable. The magnetic flux measurement method is adopted for cable force monitoring. The sensor is simulated and calibrated in the factory first, and then wound directly in the field. It is a non-destructive and non-contact measurement method, which is especially suitable for long-term monitoring of cable force after bridge completion. Based on the research and practice of the overall cable force detection and monitoring scheme of Yiling Yangtze River Bridge, this paper explores how to safely detect and monitor the cable force of the completed bridge.

Abstract:The geological conditions of the slope of Jiangping River Hydropower Station are complicated, and heavy rainfall has caused a number of large landslides. In order to ensure the overall stability of the high slopes on both sides of the left and right banks and prevent the damage of the approach road, tension anchor cables are used to support the unstable slopes to improve the stability of the slopes. The structure and construction process of tension type anchor cable are introduced.