摘要
石灰窑窑身为外部金属钢板、内部耐火砖、中间填充黄土结构;石灰窑基础为外部低配筋率钢筋混凝土、内部砂浆片石砌筑,并有出灰道空隙的方形大体积复合结构。金属外壁石灰窑窑身无法钻孔、气割又无法保证安全;基础内部衬砌质量差,孔隙率较大且有孤立碎石分布其间,采用常规φ38手持式凿岩机很难钻凿炮孔。为此,采取了对石灰窑基础炸出一个爆破缺口,使其在重力作用下失稳倒塌的定向爆破技术方案。为提高施工效率、确保安全,并使炸药爆炸能量均匀分布在设计缺口的爆破体内,通过合理设计爆破参数,在设计缺口位置的三面(正面和左右两侧面)采用大孔径潜孔钻机钻凿φ90炮孔,装填φ32乳化炸药并束药卷,并严密堵塞,安全防护。最终成功对石灰窑实施爆破拆除,取得了很好的爆破效果,确保了爆破安全,且施工作业效率大大提高。这是大孔径爆破在高耸类构筑物爆破拆除中的一次应用实践,可以为施工工期紧、小孔径不易钻孔的高耸类砼(砌石)基础构筑物的爆破拆除工程提供参考。
The structure of a limestone kiln consists of an external metal plate,internal firebricks and middle filled loess.The foundation of a limestone kiln is built by reinforced concrete with low bar ratio and internal mortar pieces masonry with a square large volume composite structure with gray channel space.It is difficult to drill blast holes with a conventionalφ38 manual rock drill because of its metal outer wall.The safety of gas cut also cannot be guaranteed.Meanwhile,the internal lining of the foundation is of poor quality,with large porosity and isolated gravel distribution.Therefore,a directional blasting technology scheme is adopted to blow up a gap on the foundation of the limestone kiln and make it unstable and collapse under the action of gravity.In order to improve the construction efficiency and safety,and make the explosive energy evenly distributed in the structure,a large hole drilling rig is used to drillφ90 holes on three sides(front,left and right sides)of the designed gap by reasonable design of blasting parameters.The blast holes are charged withφ32 emulsion explosive bundles and tightly stemmed.The successful blasting demolition of the limestone kiln proves that it can achieve a good blasting effect,ensure the safety of blasting,and improve construction efficiency.
作者
司士营
SI Shi-ying(Zhejiang Ansheng Blasting Engineering Co.,Ltd.,Shaoxing 312000,China)
出处
《爆破》
CSCD
北大核心
2022年第4期125-131,共7页
Blasting
关键词
拆除爆破
大孔径
石灰窑
复合基础
demolition blasting
large hole diameter
limestone kiln
composite foundation
