Abstract:This paper introduces the research and development, test, production, construction technology and precautions of ZH mortar, as well as its application in Guangzhou Metro Line 4 and other projects.

Abstract:The anchorage zone of the stay cable on the tower column is an important structure that transfers the self weight and external load of the upper structure borne by the stay cable of the cable-stayed bridge to the main tower. Ensuring the safety of the anchorage zone between the cable-stayed cable and the main tower is crucial and one of the key factors for the success or failure of the cable-stayed bridge. Based on the the Pearl River Huangpu Bridge, this paper briefly introduces the scheme, process and results of the full-scale segmental model test of the cable tower anchorage zone of the bridge, and also obtains important results such as cracking load and ultimate bearing load. Comparing the experimental results with the numerical analysis results through finite element analysis, the results are relatively close

Abstract:Cable conduits and steel anchor beams are important components of the internal anchoring of the cable-stayed tower of the Guanhe Bridge. The construction difficulties are how to install them, how to efficiently and accurately locate them, and how to reduce the impact of construction on their precise positioning. This article discusses several construction experiences in practical engineering

Abstract:The main bridge structure of Liuzhou Longtun Road Interchange is a through type simply supported tied steel tube concrete arch bridge with a span of 92.5m. By analyzing the temperature sensitivity of the structural system, this bridge is close to the ultimate span of similar structural forms. This article mainly introduces the structural design and static calculation of the bridge, and analyzes and studies the reasonable arch axis coefficient of the structure

Abstract:This article divides the prestressed anchor cables that have appeared in engineering into three categories based on the stress characteristics of the anchor cable anchorage section, namely load concentration type, load dispersion type, and tension compression composite type. One of each category is selected as a representative, and a detailed analysis is conducted on the structure, stress characteristics, and construction points of the pressure dispersion type anchor cables, secondary grouting full length bonding anchor cables, and tension compression composite anchor cables that are commonly used in engineering. The article emphasizes the structural measures that should be taken when using various anchor cables as permanent support

Abstract:Due to the significant characteristics of active reinforcement, deep reinforcement, flexible layout, fast construction, and good economy, prestressed anchor cables have been widely used in the reinforcement of rock and soil in the Three Gorges Reservoir area and geological disaster management engineering. According to the national standards and relevant industry norms for prestressed anchor cables, basic tests, creep tests, acceptance tests, and long-term monitoring of the anchor cables should be carried out according to different stages of design and construction, as well as the geological conditions. Based on the monitoring results, corresponding maintenance measures should be taken for the anchor cables. The paper briefly introduces the author's research achievements in monitoring prestressed anchor cables in recent years and their application in the Three Gorges Reservoir area

Abstract:Due to the different lengths between units, the stress state of each unit in the pressure dispersed prestressed anchor cable varies under the same tensioning force. In addition, due to factors such as rock deformation (anchor head displacement) in the compression zone and tensioning equipment, stress differences are also prone to occur in each anchor cable unit compared to the tension type anchor cable. When the difference is significant, it is easy to cause individual unit stress to exceed the limit or fail, affecting anchoring efficiency and solid safety. Therefore, exploring scientific tensioning techniques based on the characteristics of slope rock mass and tensioning equipment conditions during construction is an important link in the construction of pressure dispersed prestressed anchor cables. The article takes the tensioning construction of pressure dispersed anchor cables on a certain highway in Shandong Province as an example, and proposes a two-stage tensioning process method of pressure dispersed anchor cables, which involves differential load tensioning followed by overload tensioning, by analyzing the unit stress state of several tensioning methods of pressure dispersed anchor cables and the inspection results of the K14+600~950 slope engineering of the Qingdao section of the Tongsan Expressway in Shandong. Provide certain reference experience for similar projects.

Abstract:This article introduces several commonly used lifting methods for large equipment through practical engineering applications