1996年11月,家住市郊区穿山乡的于某在其原有的二层楼房上加建第三层,以包工不包料的形式包给了民工王某的建筑队。王某在无建筑许可证的情况下,未采取任何安全防护措施便开始了施工。11月17日下午6时许,一位70岁的老人朱某在于某邻居房前与人聊天,这时正在为于某建房的民工不慎碰落一根3米长的木头,正好 November 1996, who lives in the suburbs Chuanshan Township in a certain increase in its original two-story building on the third floor, in the form of labor does not wrap a package to migrant workers Wang’s construction team. Wang without construction permit in the case, did not take any safety precautions began construction. At about 6 pm on November 17, a 70-year-old man, Zhu, was chatting with people in front of a neighbor. At that moment, he was just knocking down a 3-meter-long piece of wood for a migrant worker who was building a house.