Abstract:In this paper, the loss of anchor locking tension of pressure-dispersed and tension-dispersed anchor cables, and the loss of prestressing force of anchor cables due to creep of slope geotechnical bodies are explained and discussed.

Abstract:This paper analyzes the traditional balancing circuit in detail, points out the limitations of the application of the traditional balancing circuit, and at the same time introduces a new type of balancing circuit, which effectively solves the problems of shock vibration and heat generation caused by large energy consumption of the hydraulic cylinders in the hydraulic system in the process of load downstream.

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: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:It can be said that Xiaowan Hydropower Station is unique in the construction of similar projects in terms of the complexity of engineering geology, the difficulty of slope protection and the arduous construction task. This paper mainly introduces and analyzes the construction of the 2# mountain beam rescue slope project and the special construction technology adopted in the construction for extremely complex geological conditions, focusing on the drilling construction technology and method of eccentric drilling with pipe drilling and double pipe relay drilling, and the author's construction in order to solve the problem of no wind running and no leakage of large cracks at different depths in the hole At the same time, the author puts forward some improvement suggestions on the imperfections still existing in the rescue engineering design, hoping to play a role in promoting the faster development of geotechnical anchoring engineering technology in our country.

Abstract:With the popularity of anchor cable in geotechnical engineering reinforcement, the permanent problem of anchor cable is the focus of recent attention. The permanence of the anchor cable is related to the structure of the anchor cable and the material of the anchor cable, as well as the environment and human factors. This paper attempts to put forward the reasonable structure of permanent anchor cable for reference of the cable damage factors and protection.

Abstract:This paper describes the structure, advantages and disadvantages and applicable conditions of prestressed anchor cables commonly used in geotechnical engineering reinforcement at present, especially emphasizing the standard structure of various anchor cables used as permanent support means. The purpose of this paper is to make the users of anchor cables have a correct understanding of various anchor cables and correct non-standard construction methods. When designing the anchor cable, the type of anchor cable should be selected correctly according to the property of rock mass, engineering requirements and the function of anchor cable.

Abstract:The full-scale model tests of two large cable-stayed Bridges (Nancha Bridge of Nanjing Yangtze River No. 2 Bridge and North Cha Bridge of Runyang Yangtze River Highway Bridge) are briefly introduced, and the anti-cracking safety factor and ultimate bearing capacity of cable pylon anchoring area are studied. At the same time, the rational arrangement of the prestressed cables in the anchoring area of the cable tower and the simulation effect of the cable tower segment model on the whole cable tower are also studied, which has theoretical guiding significance and practical value for the cable tower design of cable-stayed bridge.

Abstract:Problems to be noted in Construction : Cleaning Tension of steel strand in anchoring section The tension of anchor cable depends on the bonding force between steel strand and the grouting body to be transferred to the rock mass around the hole through the grouting body. Therefore, the grease on the steel strand in anchoring section must be cleaned. The anti-rust grease on the steel strand has penetrated into the internal space of the 7 steel wires, and can not only clean the surface, the steel strand must be spread out, and the 7 steel wires are cleaned and then restored. This is very troublesome and only suitable for projects with a small amount of anchor cables. For large slope projects, it is appropriate to use high temperature water jet cleaning above 90℃ in a closed container, this method does not need to disperse the steel strand and clean;

Abstract:Jiangxi Province Tai (and)-Gan (state) highway is in the mountainous and hilly area, in which there is a section of high slope maximum excavation of up to 98 m. Geological conditions for the whole weathering ~ strong weathering granite, was a fractured structure, is very easy to produce the phenomenon of slumping, sliding, etc., affecting the stability of slopes. In view of the engineering geological conditions of this section of the graben slope, the design of the comprehensive consideration of the use of pre-stressing anchor cable reinforcement program. In this paper, through the engineering practice of prestressing anchors in the high and steep road graben slope and geological conditions under the application of the construction of the key points, methods, monitoring and measuring and attention to such aspects as elaborated!

Abstract:The geological conditions of the slope of Longtan Dam are complex, and the maximum slope height of the intake slope is 435m. In order to ensure the overall stability of the high slopes on the left and right banks and the long-term operation safety of the project, 1000kN, 2000kN and 3000kN prestressed anchor cables are used in the reinforcement and support of the left and right bank slopes of the Longtan Project to improve the overall stability of the slope. This article mainly introduces the design, construction, and tensioning program of prestressed anchor cables

Abstract:A new series of steel wire rope type beam falling prevention devices is proposed in the article. This device is a product series developed successfully in China based on reference to foreign systems. Its main component, the cable body connecting the anchor cable, is composed of isolated and corrosion-resistant steel strands. The anchorage at both ends is made by squeezing and anchoring multiple steel strands together. The article provides a detailed description of the composition, characteristics, testing, engineering design, and application of the device. The research results indicate that the device has the characteristics of compact structure, good static load performance, high fatigue life, and reliable anchoring, providing a reliable guarantee for the safety of bridge structures in China under strong earthquake action. This system has been verified through engineering applications in Taiwan and other regions of China

Abstract:In the study of nuclear power plant containment, the analysis and calculation of prestress is a very important part. The distribution of the prestressed tendons in the containment is dense and complex, especially in the sensitive part of the gate entrance, the three-dimensional space curve shape appears, which increases the friction loss, and must be taken into account. Based on the analysis of friction and anchorage loss of prestress in CPR1000 stacked containment, a simple calculation method of the length affected by reverse friction and the curve of stress variation along the length direction of the standard section of containment, near the gate entrance and the prestress reinforcement of the containment dome are given for reference by engineering designers.

Abstract:Taking the external prestressed reinforcement project of Yongjiang Bridge in Nanning City as the background, a detailed analysis of the anchoring structure anchored in the general beam section of the original structure was carried out by using the spatial finite element analysis method. According to the obtained spatial stress distribution characteristics, the structural measures for local reinforcement of the anchoring structure were considered The setting of channel steel and rebar can effectively reduce the stress concentration of the concrete at this position, make the stress distribution tend to be uniform, and the local stress can meet the requirements of the standard limit. At the same time, the engineering practice shows that the finite element detail analysis method is more in line with the actual stress characteristics of the anchoring structure, and the calculation results and local reinforcement measures can be used as an important reference for the design and construction of similar external prestressed reinforced bridge anchoring structure.

Abstract:This paper introduces the basic meaning of bridge health monitoring, the urgency and significance of research and development, summarizes the research status and existing problems, and prospects the further research.

Abstract:This paper describes the structure, advantages and disadvantages and applicable conditions of prestressed anchor cables commonly used in geotechnical engineering reinforcement at present, especially emphasizing the standard structure of various anchor cables used as permanent support means. The purpose of this paper is to make the users of anchor cables have a correct understanding of various anchor cables and correct non-standard construction methods. When designing the anchor cable, the type of anchor cable should be selected correctly according to the property of rock mass, engineering requirements and the function of anchor cable.

Abstract:3．2施工中要注意的问题 3．2．1锚固段钢绞线的清洗拉力型锚索的拉力是依赖钢绞线与注浆体的粘结力经由注浆体传递给孔周的岩体，因此，锚固段钢绞上的油脂必须清洗干净。钢绞线上的防锈脂已渗入7根钢丝的内部空间，不能只清洗表面，必须把钢绞线散开，7根钢丝分别洗干净后再复原。这样做很麻烦，仅适用于锚索量小的工程。对于大型边坡工程，宜采用在封闭容器内用90℃以上高温水喷射清洗，这种方法不用散开钢绞线而且洗得干净；

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Abstract:In the construction of water conservancy and hydropower projects, prestressed anchor cables (rods) are usually used to strengthen unstable slopes to improve their stability. However, up to now, the design of prestressed anchorage is mostly too conservative, resulting in too much engineering waste, and the anchorage design theory and method need to be further studied. By analyzing the factors affecting the design parameters of rock anchor and applying optimization and decision theory, the method of determining the design parameters of rock anchor is proposed, and the decision support system RSASYS for rock anchor support design is established, which provides a new analysis method for engineering designers to design rock anchor. The practice proves that this method is feasible and can obtain great economic benefit.