Abstract:Chaobai River Bridge is a three-tower single-cable prestressed concrete low tower cable-stayed bridge. This paper mainly introduces the design conception and key points of the bridge, discusses the selection of the construction scheme and key points of the bridge, and finally briefly introduces the technical status of the short tower cable-stayed bridge in our country.

Abstract:This paper discusses the hydraulic lifting monitoring system based on PLC and configuration software in detail, and gives the technical index, control mode, hardware structure, control idea, software structure and realized functions of the monitoring system.

Abstract:This paper briefly introduces the construction technology of prestressing concrete slab in large area, and discusses the use of prestressing technology to eliminate the adverse effects of temperature stress.

Abstract:The external prestressing system was first designed and applied in the southeast half ring viaduct project of the express road in the central city of Tianjin. Taking the construction of the bridge as the background, This paper introduces the application of external prestressing system construction technology in the project, and strives to find out the process of external prestressing construction technology and the key points of construction control, find out the role and characteristics of external prestressing through the construction of the project, and prove the feasibility of the construction technology through the detection of the stress and strain of the box beam concrete, which provides technical reserves and lays the foundation for the promotion of the technology The foundation.

Abstract:Taking Beijing Sifeng Bridge 1# Ramp Bridge as an example, this paper introduces the practice of unbonded steel strand as external cable in bridge engineering, and the key points of construction of external cable.

Abstract:Based on the design, review and construction experience of more than a dozen geotechnical slope reinforcement, the author discusses the depth of force transfer of prestressed anchor cable, the concept of free section, the safety factor of slope cutting and excavation, the formation of "rock shell" by group anchors, and the reinforcement of tension. This paper introduces the excavation control deformation construction method in slope treatment. The main elements of the construction method are: safety monitoring, advance support, stratified excavation, timely slope support, strengthening slope bottom support and construction technology management. This paper mainly discusses the stress analysis of cement mortar core column in the drilling of prestressed anchor cable, and puts forward the prestressed anchor beam structure by attributing the problem to the stability of the compression rod. The structure greatly improves the bearing capacity of the prestressed anchor cable.

Abstract:In this paper, several problems of anchor cable design and construction in several national key projects under construction are discussed in detail, and our views are put forward. The advantages and disadvantages of the non-bonded anchor cable, the reasonable structure and the applicable conditions of the permanent anchor cable are discussed.

Abstract:This paper introduces the development of prestressing technology, expounds the application range and typical projects of prestressing technology, and the innovative application fields of prestressing technology.

Abstract:Highly plastic concrete: a Japanese construction company developed this kind of concrete, which is made of adding coal ash, thickening agent and plasticizer to the components of standard concrete, its weight is 1.15 times that of standard concrete, 70% lighter than other plastic concrete, and can be easily poured into the gap of the template, suitable for the production of precast concrete board.

Abstract:Located in Yangmingshan National Park, Yangjin Highway Magang hot spring scenic spot, the main hole span 134m, arch height 27 meters, SRC state arch bridge. Because it is located in a severe corrosion area with strong sulfur gas, the bridge should pay attention to landscape and ecological protection, and corrosion prevention is the focus of design. The lower arch thickness is 1.8-3.0 m steel reinforced concrete steel bone box girder, using hot-dip galvanized treatment, the main beam is 1.0 m thick hollow plate beam, using hot-dip galvanized steel bar and sulfur-resistant cement coating. After the bridge was completed and opened to traffic in 1994, it has become one of the scenic spots in Yangmingshan Scenic Area.