定向爆破拆除烟囱河南地矿厅第三地质探矿队徐建军（执笔），过熙达某造纸厂５号炉烟囱高４０ｍ，砖混结构，水泥砂浆砌筑，砂浆标号５０号，沿高度方向每四平砖内压３根直径６ｍｍ钢筋，每隔１０ｍ有一钢筋砼圈粱。烟囱底部外径５．０７ｍ，内径３．２ｍ，壁厚９４ｃｍ，... Directional Blasting Demolition of the Chimney Henan Geology and Mineral Resources Agency third geological prospecting team Xu Jianjun (writing), over a Hefei Paper Mill No. 5 chimney height 40m, brick structure, cement mortar masonry mortar number 50, along the height direction of every four flat Brick pressure 3 6mm diameter steel, every 10m have a reinforced concrete ring beam. Chimney bottom diameter 5.07m, inner diameter 3.2m, wall thickness 94cm, ...