Abstract:Taking the tensioning construction of prestressed steel bars in several major bridge projects as examples, this paper introduces the actual measurement method for the elongation value of the self anchored post tensioning method prestressed steel bar tensioning construction, and derives the segmented accurate calculation formula for the theoretical elongation value of prestressed steel bars

Abstract:With the continuous improvement of durability requirements for cable structures in bridge construction, it is becoming increasingly important to strengthen the research on the protective performance and strength characteristics of steel wire cables. Study the performance comparison between epoxy coated steel wire and galvanized steel wire, and elaborate on the superior protective performance of epoxy coated steel wire. Provide a new technology for the inner protection of steel wire cables

Abstract:Article [28] (2007) reported a pull-out failure model experiment on the failure mechanism of fully bonded glass reinforced polymer anchor rods. Research has pointed out that under conditions of high mortar strength, anchor rod tensile failure or shear failure may occur; When the axial tensile stress reaches the tensile strength of the anchor rod first, tensile failure will occur in the free section; When the maximum Shear stress first reaches the shear strength of the filament, shear failure occurs first in the anchorage section. See Figure 15 for typical distribution curve of Shear stress on the surface of the anchor section bar measured in the test

Abstract:The main bridge of Sanmenjiang River Bridge in Liuzhou is a prestressed concrete Box girder bridge bridge with double towers, double cable planes and three spans. This article introduces the system structure, overall construction plan, construction method, cable force monitoring method, construction technology, and construction points of the main bridge cable-stayed cable, and provides a detailed description of the precautions during the construction of the cable-stayed cable.

Abstract:The stay cable is an epoxy sprayed steel strand cable system, which has the advantage of being able to use lightweight construction equipment and effectively complete the installation and tensioning of the stay cable. However, it has high technical content and high precision in controlling cable force during the installation and construction of the stay cable. By introducing the installation and construction of the stay cable of the low tower cable-stayed bridge of Qiligou Hangang Bridge in Ankang, Shaanxi Province, this paper expounds in detail the installation and construction technology of the epoxy sprayed steel strand stay cable, as well as the tensioning control method of the single steel strand equivalent method, which can be used for reference by the construction personnel

Abstract:The self anchored Suspension bridge with single tower and spatial cable plane, whose main cable shape is a spatial structure, has a parabolic projection on the elevation and plane. During the construction process, the main cable is required to transition from a free plane to a spatial cable plane. Combining with the Fumin Bridge in Tianjin, this article introduces some new design and construction technologies related to spatial cable structures, and briefly describes the specific implementation methods and tensioning methods of spatial cable system transformation

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Abstract:This article introduces the design, process, and construction of ultra-high performance concrete small road bridges. These bridges are composed of prefabricated prestressed concrete beams and cast-in-place ordinary concrete panels. In order to determine the mix design, material performance and durability, and to study the tensile performance of prestressed concrete beams with and without concrete bridge decks, some preliminary tests were conducted. Through experimental analysis of prestressed high-performance concrete beams with and without fibers, the influence of steel fibers on uniformity and size effects in structural grades was verified. Determine the structural properties of the materials to design the final section of the bridge. This article also introduces an industrial feasibility attempt to prepare high-performance concrete structures using traditional raw materials and universal production techniques. At the same time, the production technology when using steel fibers was evaluated