Abstract:This article introduces the national standard "Anchorages, Fixtures, and Connection Points for Prestressed Tendons" GB/T14370-2007, and compares it with the relevant standards FIP "Recommendations" in 1993, European standard EN13391, and the American PTI "Acceptance Standard for Posttensioned Prestressed Systems" (1998)

Abstract:A new method of Widening Mountainous Highway with Integer Cantilevered Structures is proposed for steep mountainous areas after comparative analysis of the current methods used to wide roads. The design idea is that widening the road with integral casting wallpill retaining wall, making full use of exiting stable roadbed. The work principle of the integer cantilevered structures is analyzed, and successfully used in engineering practice. According to the engineering practice, this method which is applied for Widening Mountainous Highway with high and steep slope is not only simple in construction, economic and on the safe side, but also protecting environment

Abstract:More and more cable-stayed bridges are being constructed in China. With the arrival of the service life of the cables, in order to extend the service life of the bridge, it is necessary to replace the cables. This article focuses on the replacement construction technology of stay cables for the Huxi Bridge in Liuzhou. This bridge is a prestressed concrete single tower double cable plane cable-stayed bridge with a span of 2 × 120 meters. The upper structure of the cable-stayed bridge is a plate beam structure, with 26 pairs of fan-shaped cables symmetrically arranged on both sides, totaling 104. The construction process of cable replacement includes: tensioning and dismantling of old cables; Installation and tensioning of new cables; Corrosion prevention in the anchoring area of Xinsuo; Construction measurement (cable force, elevation, displacement)

Abstract:The Xinchang Chengxi Bridge is a reinforced concrete box type mid through suspension arch bridge, with the original suspension rods being 4 φ 15 steel strand cable body, replaced with equal strength principle φ 5-85 parallel steel wire ropes. Due to the original anchoring system not being suitable for the anchoring function requirements of the new cable, the new anchoring system adopts a fully welded hoop structure. When replacing the suspension rod, the principle of maintaining the same elevation and displacement is adopted for control

Abstract:The reinforcement mechanism of prestressed anchor rods was elaborated, and the reasons for the loss of prestress in soil anchor rods were analyzed. Based on engineering practice and geotechnical tests, corresponding measures for compensating prestress losses have been proposed, and the theoretical basis has been thoroughly analyzed

Abstract:This article introduces the current research status of expanded head anchor rods and anchor cables in existing soil layers both domestically and internationally, analyzes the elastic stress state of pressure type prestressed anchor cables, and believes that expanded head pressure type prestressed anchor cables in soil can effectively improve anchoring force, which is a recommended structure for application. Theoretical analysis and application introduction of this type of anchor cables are also conducted.

Abstract:The green ecological protection of high and steep rock slopes has always been a difficult point in slope engineering. In the slope protection project of K51 section of Chengya Expressway, the author designed a set of green ecological protection systems suitable for this high and steep rock slope based on accurate analysis of the geological environment of the slope engineering. This system achieves a harmonious unity between disaster prevention and environmental protection through the organic combination of green vegetation and light engineering measures, achieving good ecological effects. The ecological protection project for high and steep rock slopes has been rated as a model project for slope protection by the Sichuan Provincial Department of Transportation. After nearly 3 years of operation, it has become an economic, practical, safe, and reliable demonstration project for green ecological slopes

Abstract:This article introduces the overview of Luoyang East Main Canal Drainage Tunnel Project; This article elaborates on the solutions and precautions for key issues such as excavation collapse prevention, surface settlement, waterproofing and drainage, permanent support with sprayed concrete, and monitoring measurement in the construction of shallow buried underground excavation method.