1. The prefabricated sandwich panels board adopting the metal connector technology draws on the construction method of the German prefabricated sandwich insulation board, and connects the inner and outer concrete slabs with stainless steel connecting pieces, completely cancels the concrete rib around the periphery of the board and the window opening, and appropriately increases the thermal insulation material. Thickness to meet the insulation requirements of the external wall. After testing the thermal insulation performance of two 60mm thick polystyrene foam board sandwich concrete composite wall panels, the test results show that due to the thermal bridge existing in the stainless steel connecting piece, part of the heat is transmitted through the stainless steel connecting piece, which results in the thermal insulation performance of the sandwich panel. Significantly lower. According to the test analysis, the stainless steel connecting piece can reduce the thermal insulation performance by 10-20%. Since the thermal conductivity of steel is about 1500 times that of the thermal insulation material, the heat loss caused by the stainless steel connecting piece should be fully considered when calculating the thermal resistance value R of the sandwich panel. In order to improve the thermal insulation performance of the s eps sandwich panel , for the prefabricated exterior wall in the cold or cold regions of northern China, the design of the concrete rib around the perimeter of the panel and the window must be adopted, and the area of the shear reinforcement of the through-insulation material should be minimized or Increase the thickness of the insulation material to achieve.
2. Sandwich panel board using non-metallic connector technology Connecting the inner and outer concrete slabs with non-metallic connectors can significantly reduce the thermal bridge effect of the connectors. This is a new type of precast concrete wall insulation system, which is composed of composite reinforcing fiber connecting parts and extruded board and other insulating materials. When used, the two ends of the connecting piece are inserted into the concrete to anchor and fix the insulating material in the middle. Since the thermal conductivity of non-metallic materials is very small, the heat transfer between the two concrete slabs can be greatly reduced. The thickness of the thermal insulation material between the two slabs can be reduced to 50 mm (XPS), which can reach 65% of the three stages in Hunan. Insulation and energy saving requirements. The system eliminates heat loss by more than 80% of metal connectors. This shows that the system has superior thermal insulation performance, effectively solves the thermal bridge problem of metal connectors, and has good fire resistance and high temperature resistance.