Stainless steel-FRP (fiber reinforced plastic) composite connecting part for sandwich thermal-insulating wall

Abstract

The invention relates to a stainless steel-FRP (fiber reinforced plastic) composite connecting part for a sandwich thermal-insulating wall. The stainless steel-FRP composite connecting part is used for connecting internal and external leaf walls, is shaped like a shoot nail and mainly comprises a stainless steel main body, a plastic sleeve and FRP. A nail cap is arranged at the end part of the connecting part to increase pulling resistance between the connecting part and internal leaf wall concrete; and besides, the stainless steel fine thread surface of the upper part of the connecting part is wound with the FRP (glass fiber or carbon fiber), so that direct contact between stainless steel and concrete is reduced, heat conduction is reduced, and the thermal-insulating effect of the wall isachieved; the plastic sleeve is located in the middle of the connecting part, a plastic positioning ring is arranged at the junction of the upper part and the middle part, and sliding between the connecting part and a thermal-insulating layer can be prevented; and the adhesion force between the connecting part and the outer leaf wall concrete can be increased by means of stainless steel coarse threads at the lower part of the connecting part. The connecting part has the advantages of being high in strength, low in heat conductivity coefficient, good in durability (corrosion resistance), excellent in fire resistance and convenient to construct, and can realize standardized production.

Description

technical field [0001] The invention relates to a stainless steel-fiber reinforced plastic composite connector for prefabricated concrete sandwich insulation walls, belonging to the technical field of structural engineering. Background technique [0002] Existing studies have shown that the heat transfer heat consumption of the building envelope accounts for more than 80% of the total building energy consumption. In order to reduce building energy consumption and achieve the goal of building energy conservation, the outer wall of the building mainly adopts three types of external insulation, internal insulation and sandwich insulation. Among them, internal thermal insulation occupies the indoor usable area and is rarely used in engineering, while external thermal insulation is widely used in various buildings. However, in recent years, due to frequent fire accidents of external thermal insulation of external walls, resulting in a large number of casualties and economic losse...

AI Technical Summary

Problems solved by technology

[0004] At present, the connectors used in precast concrete sandwich insulation walls at home and abroad mainly include metal materials and fiber reinforced plastics (Fiber Reinforced Polymer / Plastic, referred to as FRP), including: steel connectors, stainless steel connectors and fiber reinforced plastics (FRP) connectors There are many problems in the above connectors: although the steel connectors have the advantages of high strength, low price, and easy processing, but the thermal conductivity of the material is large, there is a "thermal bridge" effect, which reduces the thermal insulation effect of the wall (reduces the thermal conductivity of the wall) thermal coefficient), and the corrosion resistance of steel bars is poor, reducing the service life of components

Stainless steel connectors have high strength and good corrosion resistance, and the thermal conductivity of the material is lower than that of ordinary steel bars, but its cost is high

Although fiber reinforced plastic (FRP) connectors have the advantages of high tensile strength, strong corrosion resistance, and low thermal conductivity (lower than that of metals such as stainless steel), their shear strength is low and they are brittle materials.

Of particular concern is the poor fire resistance of fiber reinforced plastic (FRP) connectors, which include carbon fiber reinforced plastic (CFRP), glass fiber reinforced plastic (GFRP) and aramid fiber plastic (BFRP) etc. The above fiber-reinforced plastics are all composed of resin and fibers. The resin reaches the glass transition temperature at 90-120°C, the resin softens, and the bonding force between the fiber-reinforced plastic (FRP) connector and the concrete deteriorates, and the wall The fire safety is affected, the outer leaf wall and the inner leaf wall cannot cooperate to bear the force, and even the outer leaf wall and the connecting piece fall off, causing the outer leaf wall to fall

In recent years, there have also been connectors wrapped with fiber-reinforced plastic on the outside of steel bars in China. Due to the thinner outer leaf wall, the temperature inside the outer leaf wall is higher under the action of fire, and the above-mentioned risks also exist in the part of fiber-reinforced plastic inside the outer leaf wall.

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