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一、基本情况烟囱横断面为矩形,从下而上逐渐缩小(照片1)。烟囱全高14米;砖结构,水泥砂浆抹缝;已建成20多年,没有破损;烟囱东面砖墙自基础向上有一门洞。烟囱南11米是新民用构筑物;向西1.0米是围墙,墙外侧1.2～3.0米是民房;向北和东40～45米是空场(图1)。由此可知,烟囱只能向东北方向倒塌。爆破切割处选在烟囱体与基础结合部,
First, the basic situation The cross section of the chimney is rectangular and gradually decreases from the bottom up (photo 1). The full height of the chimney is 14 meters; brick structure, cement mortar and joints; has been built for more than 20 years and has not been damaged; the east brick wall of the chimney has a hole up from the foundation. The 11m south of the chimney is a new civil structure; 1.0m to the west is the wall, 1.2 to 3.0m outside the wall is a private house; 40 to 45m north and east are empty fields (Figure 1). It can be seen that the chimney can only collapse to the northeast. The blasting cutting is selected at the joint between the chimney body and the foundation.