1. Grouting reinforcement technology for deep cracks in structures is a mature technology, which has been applied to mass concrete structures such as dams and floors of high-rise buildings for many times. At present, the deepest crack in grouting treatment has reached 2m. Random sampling and coring inspection show that the density and strength of concrete structure after grouting meet the requirements. The technology of rectifying deviation of building structure and strengthening foundation and foundation adopts stress relieving method, pile cutting method, jacking method and information feedback method to rectify deviation of local or whole building structure and engineering structure caused by various reasons (such as foundation settlement and foundation construction).
2. Underpinning reinforcement technology refers to the functional transformation of the original load-bearing structure that affects the use function of the building by changing the reinforcement system of the stressed building, in order to obtain a more ideal use space. Structural underpinning methods generally include steel underpinning, reinforced concrete underpinning and truss underpinning.
3. Foundation underpinning technology refers to the subway or underground tunnel built in the city inevitably passing under the building. In order to avoid demolition and reconstruction, pile foundation underpinning must be carried out for ground buildings. This technology is mainly used to transfer the upper load borne by this pile foundation to the newly built pile foundation outside the tunnel by using the beam transfer floor near the pile cap when the underground tunnel passes through the pile foundation of the building that needs to be truncated. Substitution of new pile foundation underpinning structure system. In order to ensure that the underpinning buildings will not be damaged due to cracking and inclination after the broken piles and tunnels pass through, technologies such as prestressed tensioning of underpinning beams, jack-up and grouting at the bottom of piles are adopted, and many patented technologies such as miniature rock-socketed steel pipe cast-in-place piles and concrete interface connection technology can be applied to pile foundation underpinning.
4. Sticking steel to strengthen the column technology. In this technology, angle steel, steel hoop and original concrete column are connected by adhesive bolts, and high-strength inorganic bonding materials are poured into a whole. This method not only improves the bearing capacity of the column by increasing the section of angle steel, but also makes the original concrete column have a good triaxial stress state because of the lateral constraint of the new steel hoop, so it can greatly improve the bearing capacity of the column.
5. Bonding steel plate reinforcement technology can greatly improve the original design bearing capacity and damage resistance of reinforced concrete structural members strengthened with steel plates. This is because after the steel plate is pasted, the reinforcement amount of the original structural member is improved, and the mechanical properties of the structural member in terms of tensile strength, bending strength and shear strength are also improved accordingly, and these properties are guaranteed by the good bonding performance of structural adhesive, which firmly bonds the steel plate and concrete together to form a whole and effectively transmits stress.
6. The strengthening technology of sticking carbon fiber cloth outside is to bond the carbon fiber cloth to the surface of the member through matching bonding materials, so that the carbon fiber cloth bears tension, which is in harmony with the deformation of concrete and bears the same force. Fiber cloth has excellent physical properties such as high strength, light weight, corrosion resistance and fatigue resistance, as well as good adhesion and wide applicability. It is a new technology to strengthen concrete structures with carbon fiber sheets instead of steel plates in recent years.
Strengthening technology of enlarging section, also known as concrete wrapping reinforcement technology, is to increase the section and reinforcement of components to improve their strength, stiffness, stability and crack resistance, and can also be used to repair cracks. This reinforcement technology has a wide range of applications, and can reinforce plates, beams, columns, foundations and roof trusses. According to the different purposes and requirements of reinforcement, this technology can be divided into reinforcement based on enlarging cross section and reinforcement based on reinforcement, or both. In order to ensure the normal work of supplementary concrete, structural steel bars should also be properly configured for steel bars with larger cross sections. In order to ensure the normal work of reinforcement, the section size should be appropriately increased according to the structural requirements such as reinforcement spacing and protective layer. During reinforcement, steel bars should be welded to make the new and old concrete combine well.
7. Planting reinforcement technology? Steel planting? This technology, also known as reinforcement rooting technology, drills holes in the original concrete structure, injects structural glue, and inserts new reinforcement into the holes through rotation. This technology is widely used in design changes, adding beams, columns, cantilever beams, slabs and other reinforcement and change projects. This technology is put forward to avoid the structural damage caused by destructive conventional construction methods such as hammering when the reinforced concrete structure is opened, and it is also a method to strengthen the periphery of the hole. Hole-forming technology has been widely used in floors, shear walls and core tubes of high-rise buildings.