In the external insulation system, the strong destructive effect of wind load negative pressure can be ignored. In order to ensure the safety of the system under unforeseen circumstances, mechanical anchor bolt reinforcement is usually used, especially in high-rise buildings, when the elevation of thermal insulation part is more than 20 meters, mechanical anchor bolt must be used for reinforcement, the safety factor of mechanical anchorage system can be less than 5 times, that is, the ultimate tensile bearing capacity of single anchor bolt is greater than equal to 1.5kn. For this reason, it is required that the material of screw is stainless steel metal with surface anti-corrosion treatment, plastic expansion pipe round pressure plate shall be made of nylon other materials; the anchor bolt set must be inspected qualified by the authority provided with inspection report before it can be used. The results show that the tensile bearing capacity of anchor bolt is directly related to the structural form of anchor bolt, locking mode, material form of anchoring matrix.

At present, the common external wall structure of anchoring matrix is very complex. In the past, ordinary expansion bolts shooting nails, which only rely on expansion locking, are suitable for the anchoring requirements of diversified external wall structures. A multifunctional anchor bolt is needed, which is suitable for both solid walls hollow, fluffy soft walls. Germany has a lot of successful experience practice in the field of exterior wall exterior insulation fasteners, which is worth learning learning .