jackpottripleplay| Zhongke Jiantong develops high-performance material CAST to solve the problem of safe excavation of underground projects
A few days ago, it was jointly carried out by the scientific research team of China Science and Technology Jiantong and Dongfang Yuhong Engineering Technology Center.JackpottripleplayThe research project of CAST (inorganic modified water glass grout), a special material for grouting improvement in water-rich sand and pebble strata, has ushered in phased progress. The systematic evaluation shows that the properties of CAST materials fully meet the requirements of the index, meet the engineering requirements such as safe excavation of water-rich sand and pebble strata, and have innovative advantages such as green environmental protection, economy, high efficiency and safety, and strong applicability, which is an important breakthrough in the field of material research and development.
Industry pain point-- traditional grouting materials are difficult to ensure safe excavation
The water-rich sand and pebble stratum has many difficulties, such as large permeability coefficient, high water head, high flow velocity, difficulty in groundwater treatment and so on. dewatering and grouting are generally used to solve the excavation problems. However, under the background of the rise of groundwater level and the protection of water resources in Beijing, the limitation of dewatering construction in rail transit construction is obvious, so grouting to improve and strengthen strata has become the first choice.
However, when traditional materials such as cement water glass and modified water glass are used to improve and strengthen the water-rich sand and pebble stratum, the construction effect is not ideal, and there are some problems, such as poor water erosion resistance, low retention rate, poor reinforcement and water stop effect, and so on. The goal of safe excavation can not be effectively achieved.
The goal of R & D-- to solve the important and difficult problems of engineering with scientific research and innovation
Protecting the safety of underground projects with innovative science and technology is the value goal that Zhongke Jiantong people unremittingly pursue.
Centering on the demand of safe excavation of sand and gravel layer, the scientific research team promotes research and development according to the core ideas such as rapid condensation and anti-erosion water sealing, and pays close attention to the physical performance index and application performance index of materials. focus on materials anti-scour, flow energy, durability and other indicators, scientific and systematic research and development and evaluation of new materials.
The R & D team drives the high-quality development of engineering practice with scientific research and innovation, applies CAST materials to the engineering end, deeply verifies its performance, strives to achieve the goals of water stability and structural stability, and actively obtains accurate effect evaluation.
Material advantage-green, high performance and strong engineering applicability
CAST material is a kind of environment-friendly material suitable for grouting improvement and reinforcement of sand and gravel stratum in underground engineering. It uses a variety of inorganic salt curing agents, does not contain chloride ions and acidic substances, has no pollution to groundwater, and will not corrode steel bars and equipment.JackpottripleplayNo volatile substances in the construction, no peculiar smell, friendly construction.
It is an important advantage of CAST material to effectively solve the problem of stopping water by grouting in sand and gravel strata under the condition of rich water and moving water, and to achieve the goal of safe excavation with little or no precipitation, which can not only save the high construction cost of precipitation, but also help to protect groundwater resources.
After laboratory research and development, indoor application test research, material pilot test, engineering application and other system development and evaluation show:
The performance index of → CAST material formula meets the requirements of enterprise standard, the stability of repeated verification results is good, and the economic index also achieves the set target. The test results show that the performance of the pilot product is stable.
The simulation tests of stable pressure injectability simulation test, steady pressure grouting water stop test and dynamic water grouting anti-erosion test of → show that CAST material is obviously better than traditional materials such as modified water glass and cement water glass in gel water precipitation rate, volume stability and water-land strength ratio.
The long-term experimental evaluation of the effectiveness of permeability coefficient of → shows that the permeability coefficient of CAST material and sand-pebble consolidation is lower than that of modified water glass and cement-water glass samples, showing good waterproof performance.
The application test of → project shows that CAST material has strong applicability and can be constructed by traditional grouting technology and equipment. The results show that the material is well consolidated in the sand and pebble stratum, the permeability and diffusion range of the slurry can be controlled, the strength of the stone body is moderate, and there is no water leakage in the excavated face.
Up to now, the research project of grouting improved materials in water-rich sand and pebble strata has produced rich intellectual property achievements. The project has been submitted for review and authorized "an anti-dispersion grouting material for water-rich formation grouting and its preparation method and construction method" (Patent number: ZL 2022 1 0618594)Jackpottripleplay.7) and other three invention patents, published special research papers and compiled enterprise standards for grouting materials, in order to promote and lead the high-quality development of the industry and create a lasting and safe underground engineering safety excavation environment, contribute to the professional wisdom and strength of China Science and Technology Jiantong.
