20世纪90年代初,在图集里出现了使用膨胀螺栓的做法。在图集中,膨胀螺栓的胀管被画成类似锥体浇筑在混凝土里,给人以很安全的印象。实际上,这是一种误导。现以M12膨胀螺栓为例(图1),说明膨胀螺栓的膨胀状态:螺栓的胀管长度为65mm,如果装饰层厚度为35mm,那么在墙体内的长度只有30mm,而起作用的胀管端头只有不足1mm左右。 The early 1990s saw the use of expansion bolts in the Atlas. In the Atlas, expansion of the expansion bolt is painted like a conical body poured into the concrete, giving a very safe impression. In fact, this is a misleading one. Now M12 expansion bolt as an example (Figure 1), expansion of the expansion bolt state: expansion bolt length 65mm, if the decorative layer thickness of 35mm, then the length of the wall is only 30mm, and the role of the expansion tube End less than 1mm only about.