Anchor rod (also known as soil layer anchor rod, soil nail) is drilled in the natural soil layer side wall, put into the tension rod, grouting anchoring formation. According to the different materials used, the tension rod can be divided into thick steel bar, high strength steel wire bundle, steel strand and so on. The section area, number of layers, spacing and length of bolt on side wall are determined by calculation. Borehole diameter shall be determined by design.
Anchor rod industry overview
Anchor bolt is the most basic component of roadway support in contemporary coal mines. It strengthens the surrounding rock of roadway together so that the surrounding rock supports itself. Bolt is not only used in mines, but also used in engineering technology to strengthen the main body of slopes, tunnels and DAMS. As a tension member deep in the stratum, one end of the bolt is connected with the engineering structure, and the other end is deep in the stratum. The whole bolt is divided into free section and anchoring section. The free section refers to the area where the tension at the head of the bolt is transmitted to the anchor solid, and its function is to apply prestress to the bolt. The composition of bolt must have several factors: ① a tensile strength is higher than the rock and soil body of the rod body. ② One end of the rod body can be in close contact with the rock and soil body to form friction (or bonding) resistance. (3) The rod body located at the other end of the outside of the rock and soil body can form radial resistance to the rock and soil body.
Anchor rod (also known as soil layer anchor rod, soil nail) is drilled in the natural soil layer side wall, put into the tension rod, grouting anchoring formation. According to the different materials used, the tension rod can be divided into thick steel bar, high strength steel wire bundle, steel strand and so on. The section area, number of layers, spacing and length of bolt on side wall are determined by calculation. Borehole diameter shall be determined by design. There are two kinds of cement mortar and concrete commonly used in hole grouting, which should be selected by design to determine its mix ratio or strength grade, generally using cement mortar grouting. The drilling hole should be tilted downward at a 15°~35° Angle, which is determined by the design. The grouting in the hole can be full filling, or only a certain anchoring length at the bottom of the hole, which is determined by the design, and the pressure grouting should be used according to the design requirements. When the design is multi-layer bolt, the bolt construction shall be carried out when the elevation of the first layer bolt is dug. After the construction of the first layer bolt is completed, the earth excavation shall continue downward until the whole work is completed. There are two kinds of drilling methods: manual drilling and mechanical drilling.
The bolt support has both the functions of support and reinforcement, and compared with the usual way to maintain the stability of the structure by gravity, it has many more distinctive features: 1. After the excavation of the rock mass and soil mass, it provides supporting force, which plays an obvious role in protecting the strength of the rock and soil mass, controlling the further expansion of the deformation of the rock and soil mass and improving the safety of the entire construction process; 2. 2, can effectively improve the original stress state of rock and soil body, so as to further improve the stability of rock and soil body; 3. It can effectively strengthen the shear strength of the weak structural plane of the rock and soil body, thereby improving the mechanical properties of other aspects of the rock and soil body; 4. The structure and the rock and soil body are closely acted together to form a system that jointly resists external forces; 5, the role of the anchor, density, structural parameters, direction and application time can be easily adjusted and set, so as to obtain the best stability with the least support force.
Analysis of market competition pattern of bolt industry
With the continuous expansion of infrastructure construction and engineering construction, the demand for bolt is also growing year by year. The global anchor bolt market is already in the billions of dollars and is expected to continue to expand in the coming years. Among them, the market size of China's mining anchor is particularly significant, and shows a rapid growth trend.
According to the "Competition Pattern and Investment Risk Analysis Report of China's anchor rod Industry in 2022-2027" released by the China Research Institute of Puhua Industry:
Nowadays, China's coal mine demand will still maintain a steady rise in a certain period of time, and even a rapid rise in the face of the increase in coal mine demand, mining conditions in all aspects are becoming more and more complex. In addition, the rectangular fracture surface often appears in the roadway, and its bearing capacity is small, so the column surface protecting the coal roadway is also small for a long time. All the above factors lead to the safety support of roadway in mining coal mine is very difficult and complicated, and the requirements for support are also higher, and the bolt support undoubtedly solves this technical problem well.
Anchoring technology as a technical means of technological and economic superiority, more and more widely used in various engineering fields, currently not only widely used in the world's major coal-producing countries, but also promoted in metallurgy, water conservancy and hydropower, railways and highways, military and construction projects, with the arrival of the "21st century - the century of underground engineering", can be predicted, This technology will certainly get more extensive and in-depth research and application.
There are many manufacturers in the anchor rod market, and the competition is more fierce. These companies compete for market share mainly by improving product quality, performance and price. In the field of mining anchor, some well-known enterprises such as Zhongnan Shenghong, Treasure House, Zhongshan Iron and Steel Group, Dongyang Iron and Steel Group, etc., have occupied a certain position in the market. The structure of the bolt market varies by region and technology level. In some regions, such as southeast China, there are more enterprises with higher technology level and the market competition is more intense. At the same time, the anchor bolt market also shows a north-south difference, and the southern market occupies a dominant position. The intensification of market competition prompts enterprises to constantly strengthen technological innovation and brand building, improve product quality and service level, in order to gain more market share in limited market resources.
With the continuous progress and application of science and technology, the anchor rod industry is developing in the direction of technological innovation, brand building and service upgrading. Enterprises need to pay attention to changes in market demand and the impact of policies to respond to changes and challenges in the market. The anchor rod industry market shows a steady growth trend, but it also requires enterprises to continue to innovate and adapt to market changes. At the same time, the government and society also need to pay attention to the sustainable development of the industry and environmental protection issues, to provide a good environment for the healthy development of the industry.
Prediction of future development trend of bolt industry
Technological innovation is an important driving force to promote the development of the anchor rod industry. In the future, the anchor rod industry may continue to develop in the direction of high strength, high durability and environmental protection. By adopting new materials, optimizing structural design and improving production technology, the performance and quality of bolt can be continuously improved to meet more complex and demanding engineering needs. According to statistics, the global anchor market is expected to reach $879 million in 2023, and is expected to grow to $1.44 billion in 2030. As one of the world's largest construction markets, China's anchor market is also considerable. In addition, the recoverable bolt market is also expanding, and the market size is expected to reach about 10 billion yuan by 2025.
The future development trend and prospects of the anchor rod industry look more optimistic, but it also requires enterprises to continue to innovate and adapt to market changes. While maintaining the sustainable and healthy development of the industry, paying attention to environmental protection, promoting technological innovation and strengthening market competitiveness will become an important development direction of the industry. At the same time, the government and society also need to pay attention to the sustainable development of the industry and environmental protection issues, to provide a good environment for the healthy development of the industry.