摘要
以某建设项目路基控制爆破工程为研究背景,为消除路基爆破产生的爆破飞石、振动对邻近玻璃幕墙造成的安全隐患,结合工程特点,对爆破参数及安全防护措施作如下设计:采用多打孔、少装药的方式,钻设孔排距为2.5 m×2.2 m的密集炮孔,选择便于覆盖防护的矩形布孔方式,通过控制单孔装药量及填塞质量,确保爆破能量释放的均匀性;采用掏槽爆破方式,选取两孔一响的导爆管雷管毫秒延期起爆网路,合理设置各孔延期时间,避免段位叠爆现象,减少爆破振动产生的不利影响;在安全防护上,对全炮被覆盖与密目网加压炮被两种安全防护措施进行了优缺点对比,经综合考虑,选用了密目网加压炮被的安全防护措施。工程实践表明,玻璃幕墙安全无损,爆破效果良好。不仅有效地控制了爆破振动、爆破飞石等危害效应,而且与常规炮孔全覆盖防护方式相比,减少了防护工作量、节省了防护成本、降低了防护时破坏网路的概率,其爆破参数及安全技术措施的成功应用在一定程度上可为类似工程提供参考。
Taking the controlled blasting engineering of subgrade of a construction project as the research background,the blasting parameters and safety protection measures are designed to eliminate the potential safety hazards caused by blasting flying stones and vibration caused by subgrade blasting to the adjacent glass curtain wall.The design includes:More holes and less charge are used to drill dense holes with a spacing of 2.5 m×2.2 m,and a rectangular hole layout method is selected to facilitate covering and protection,By controlling the charge and filling quality of single hole,the uniformity of blasting energy release is ensured;In the way of cutting blasting,a method of simultaneous initiation of two holes in the millisecond delay initiation network is selected,and the delay time of each hole is set reasonably to avoid the phenomenon of section stacking and reduce the adverse impact of blasting vibration;In terms of safety protection,the advantages and disadvantages of the two safety protection measures of the quilt made of old tires cover and the quilt made of dense-mesh-pressurization old tires cover are compared.After comprehensive consideration,the safety protection measure of dense-mesh-pressurization old tires cover is selected.The engineering practice shows that the glass curtain wall is safe and nondestructive,and the blasting effect is good.Compared with the conventional full coverage protection method of blast holes,it not only effectively controls the harmful effects such as blasting vibration and blasting flying stones,but also reduces the protection workload,saves the protection cost and reduces the probability of damaging the network during protection.The successful application of the blasting parameters and safety technical measures can provide reference for similar projects to a certain extent.
作者
薛永利
孙飞
顾云
李飞
刘勤杰
刘迪
XUE Yong-li;SUN Fei;GU Yun;LI Fei;LIU Qin-jie;LIU Di(Nuclear Industry Nanjing Construction Group Co.,Ltd.,Nanjing 211002,China)
出处
《爆破》
CSCD
北大核心
2022年第3期112-115,共4页
Blasting
基金
江苏省地质矿产勘查局年度科研项目(2021KY10)。
关键词
路基开挖
控制爆破
参数优化
安全技术
subgrade excavation
controlled blasting
parameter optimization
security technology
