【摘要】 四川华电珙县电厂混凝土拱围堰爆破拆除规模大,距离取水泵房建筑物较近,爆破拆除所诱发的爆破振动可能对取水泵房的安全产生不利影响。混凝土拱围堰爆破拆除采用了孔内分段、孔外接力的毫秒微差起爆网路,解决孔间、孔内的分段问题,减小爆破振动危害。在取水泵房拦污栅、闸墩、泵房基础和配电房基础等主要保护部位进行爆破振动监测,结果表明,在泵房某些部位爆破振动呈现一定的放大效应,并出现了振动叠加现象,实测得到的最大峰值质点振速为14.77cm/s,实测峰值质点振速均未超过建议的安全控制标准,取水泵房没有产生明显破坏。更多还原

【Abstract】 In the explosion demolition of large-scale concrete arch cofferdam of power plant in China Huadian Corporation Sichuan Company in Gong county,the distance between explosion source and the pumping station was small.The safety of pumping station could be adversely affected by blasting vibration induced by cofferdam blasting demolition.Milliseconds delay blasting network of the sublevel interval charging inside the hole and relay ignition outside the hole was adopted in the blasting demolition of concrete arch cofferdam.The problem of decking charge between and inside the holes was solved and the blasting vibration damage was reduced.The blasting vibration monitoring was conducted in the main protection part of the pumping station such as trash rack,gate pier,pumping room basis and transformer room basis.The monitoring results show that the blasting vibration had a certain amplification effect in some parts of the pumping station.Some superposition phenomenon appeared in blasting vibration and the maximum peak particle vibration velocity was 14.77 cm/s,which was less than blasting vibration safety control standard and the pumping station had not been affected significantly.更多还原