With the rapid development of China's economy and the continuous expansion of the scale of infrastructure construction, concrete, as the core material of construction projects, is widely used in municipal engineering, water conservancy facilities, highways, tunnels, bridges and other fields. However, in the construction and later maintenance and reinforcement of concrete pavement, bridges, tunnels and other structures, how to ensure the close integration between the old and new concrete layers has become a technical problem to be solved urgently.The traditional chiseling method has problems such as low efficiency, high labor intensity, and serious environmental pollution, while high-pressure water jet chiseling technology, as an emerging non-destructive joint technology, is gradually replacing the traditional method and becoming the new favorite of the industry.
Limitations of traditional concrete chiseling methodsIn concrete construction, chiseling is to improve the adhesion between the old and new concrete layers, increase the friction between the layers, and thus ensure that the concrete poured in stages forms a whole. However, there are many drawbacks in the traditional chiseling method, which is difficult to meet the high standards of modern engineering.
Manual chiseling is the use of steel drills, hand hammers and other tools to hammer and hammer on the surface of concrete. Although this method is simple, the efficiency is extremely low, the labor intensity of the worker is large, and the chiseling effect is uneven, and the surface roughness is insufficient or excessive damage is easy to occur. In addition, manual chiseling is time-consuming and labor-intensive, making it difficult to meet the needs of large-scale projects.●Mechanical piston type impactMechanical piston impact is the chiseling of the concrete surface by the impact force generated by the mechanical device. Although this method is highly efficient, the mechanical shocks and high-decibel sound waves generated can cause destructive damage to the concrete protective layer, affecting the integrity and service life of the concrete structure. At the same time, the noise pollution generated during the construction process also has a negative impact on the environment and the health of construction workers.●Other mechanical chiseling methodsMilling machines and shot blasting machines are two other common types of mechanical chiseling equipment. Although the milling machine can quickly remove the surface layer of concrete, its milling depth is difficult to accurately control, and the cutting force and vibration force are too large, which can easily cause damage to the concrete structure. Although the surface of the shot blasting machine is smooth and beautiful after construction, the depth of chiseling is shallow, and it cannot form an obvious concave and convex surface, which is difficult to meet the requirements of close combination of new and old concrete layers. In addition, these mechanical chiseling methods produce a large amount of dust during construction, which is harmful to the environment and the health of construction personnel.
The principle and advantages of high-pressure water jet chiseling technologyHigh-pressure water jet chiseling technology is a new type of technology that uses high-pressure water jet to roughen the surface of concrete. It works by raising the pressure of the water flow to hundreds or even thousands of atmospheres through a high-pressure water pump, and then transporting it to the nozzle through a high-pressure pipe to form a high-speed jet. This high-speed jet hits the surface of the concrete, causing microcracks in its surface layer, and rapidly spreading, extending and intersecting under the action of the subsequent jet, and finally peels off the surface concrete from the main structure, revealing the coarse aggregate and forming an uneven joint surface.
●High efficiency and accuracy
The high-pressure waterjet chiseling technology can precisely control the depth and range of chiseling according to the engineering needs, and is suitable for concrete structures of different thicknesses and strengths. Its construction efficiency is much higher than that of traditional methods, which can greatly shorten the construction period.
●Non-destructive and environmentally friendly
Since the high-pressure water jet uses water as the medium, there will be no mechanical shock or noise pollution during the construction process, and there will be no damage to the protective layer and steel structure of the concrete structure. In addition, the water jet can also remove rust from the steel structure, further improving the quality of the project. There is no dust generated during the construction process, which is environmentally friendly and meets the requirements of green construction.
●Mechanization and automation
The high-pressure water jet chiseling technology can be easily installed on various mechanized and automated equipment to achieve efficient and accurate construction. This not only reduces labor costs, but also improves the safety and reliability of construction.
Application scenarios for high-pressure water jet chiseling technologyOur high-pressure water jet chiseling technology is widely used in the construction and maintenance and reinforcement of various concrete structures, especially in the following scenarios:● Bridge and tunnel engineering
In the construction of bridges and tunnels, the combined quality of the old and new concrete layers is directly related to the integrity and durability of the structure. The high-pressure water jet chiseling technology can form a high-quality joint surface without damaging the original structure, ensuring the stability and safety of the structure.
● Water conservancy facilities
Water conservancy facilities such as dams and sluices have extremely high requirements for the impermeability and durability of concrete structures. The high-pressure water jet chiseling technology can effectively improve the bond strength of the old and new concrete layers, preventing leakage and structural damage.● Municipal engineering and road constructionIn municipal engineering and road construction, the maintenance and reinforcement of concrete pavement is a common work content. The high-pressure waterjet chiseling technology can complete the chiseling operation quickly and efficiently, ensuring the close integration of the old and new concrete layers and extending the service life of the pavement.As an emerging non-destructive joint technology, high-pressure water jet chiseling technology effectively solves the problems of low efficiency, serious environmental pollution and great damage to the structure of traditional chiseling methods. Its high efficiency, environmental protection and non-destructive nature make it have broad application prospects in bridges, tunnels, water conservancy facilities, municipal engineering and other fields.With the continuous progress of technology, high-pressure water jet chiseling technology will inject new vitality into China's infrastructure construction and promote the overall improvement of project quality.
