3results about How to "Improve self stability" patented technology

The application provides a variable-span support device for a through-type movable formwork and a displacement method thereof, and belongs to the technical field of highway bridge construction. A plurality of main beam support point beams are arranged in the inner cavity of the main beam of the formwork, serving as force bearing support points of the main beam of the formwork and being used for variable-span support; and longitudinal slides are arranged between adjacent main beam support point beams, the longitudinal slides serving as connecting channels between the adjacent main beam support point beams, so that the suspended double-support-point self-balancing support device at the bottom of the main beam support point beam can slide from one main beam support point beam to another main beam support point beam along the longitudinal slide. The component structure of the application is simple, and all the components are installed in the inner part of the main beam of the formwork, effectively reducing the support height of the main beam of the formwork and increasing the stability and construction safety of the formwork; when the support point is converted, the crane is not needed for hoisting and transporting, and only a tow chain is needed to realize the sliding displacement of the support device.

This invention relates to the field of flame-retardant composite materials, specifically to flame-retardant composite materials based on the synergistic reinforcement of talc and graphene sheets and their applications. It addresses the problem that existing polymer materials struggle to simultaneously achieve reinforcement, flame retardancy, and lightweighting, and require large quantities of high-performance additives. The process involves first mixing talc sheets, graphene, a composite flame retardant, and a dispersant in a high-speed mixer, then cooling to room temperature to obtain a premix. A polymer matrix is ​​then added to a twin-screw extruder. The premix and other auxiliary additives are added through a side feed port, melt-blended, water-cooled, air-dried, and pelletized to obtain composite material particles. These particles are then vacuum-dried and injection-molded to obtain the flame-retardant composite material. The flame-retardant composite material possesses excellent flame-retardant and mechanical properties, exhibiting outstanding overall performance and being more suitable for industrial production.

The application provides a tunnel excavation selection method considering the relationship between the initial stress direction and the tunnel axis, and relates to the technical field of tunnel construction.The application comprises the following steps: firstly, performing engineering geological survey along the tunnel to be excavated to obtain the stress direction along the tunnel; and then taking the spatial relationship between the maximum principal stress direction and the tunnel axis as a reference standard to determine the partial excavation method.The application verifies that the selection principle of the excavation scheme has a strong control effect on the deformation of surrounding rock in the excavation process through numerical simulation, comprehensive analysis and field monitoring, and the method can provide a reference for the selection of excavation methods in future construction processes.