正反无轴双螺旋湿式混凝土喷射机的研究与应用  

Research and Application of Front and Back Non-axis Double Helix Wet Concrete Spraying Machine

作　　者：刘子文 LIU Ziwen(State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China;CCTEG Shenyang Research Institute,Fushun 113122,China;Key Laboratory of National Mine Safety Supervision Bureau for Coal Mine Fire and Gas Prevention and Control,Fushun 113122,China;Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]煤矿安全技术国家重点实验室,辽宁抚顺113122 [2]中煤科工集团沈阳研究院有限公司,辽宁抚顺113122 [3]煤矿火灾及瓦斯防控国家矿山安全监察局重点实验室,辽宁抚顺113122 [4]辽宁工程技术大学,辽宁阜新123000

出　　处：《煤矿机电》2024年第2期12-18,共7页Colliery Mechanical & Electrical Technology

摘　　要：目前我国井下混凝土喷浆机多为转子式结构,以风力输送混料进行干喷工艺,但干喷存在混凝土喷射期间粉尘浓度大、回弹率高等问题。为了解决干式喷浆工艺存在的喷浆料回弹率高、作业空间粉尘量大、劳动效率低、喷浆材料混合不均匀、混凝土强度低等问题,减少现场作业人员尘肺病的发生,改善劳动作业环境,优化喷浆料的混合效果,对比目前国内外的喷浆机特性,以山西汾西中兴煤业四采区瓦斯治理底板岩巷为背景,开发了一套无轴双螺旋湿式混凝土喷浆机,并对无轴双螺旋搅拌装置进行数值模拟试验研究,该无轴双螺旋搅拌装置为喷浆材料与水充分发生水化反应提供了技术保障。通过现场试验,喷浆作业区域粉尘浓度在8~10 mg/m 3,湿式混凝土喷浆机喷射能力8 m 3/h,相比较普通干式喷浆机,采用湿式喷浆机所制备的混凝土强度提高65%。实践表明,使用无轴双螺旋搅拌机构的湿式混凝土喷浆机在提高喷浆效率、强化围岩应力状态、改善工人作业环境等方面有改善明显。At present,most of the underground concrete spraying machines in China are rotor type structures,which use wind power to transport the mixture for dry spraying process.However,dry spraying has problems such as high dust concentration and high rebound rate during concrete spraying.In order to solve the problems of high rebound rate of shotcrete material,large amount of dust in the working space,low labor efficiency,uneven mixing of shotcrete materials,and low concrete strength in the dry shotcrete process,reduce the occurrence of pneumoconiosis among on-site workers,improve the working environment,optimize the mixing effect of shotcrete materials,and compare the characteristics of shotcrete machines at home and abroad.Taking the gas treatment bottom rock roadway of the fourth mining area of Zhongxing Coal Industry in Fenxi,Shanxi Province as the background,a set of non-axis double helix wet concrete shotcrete machine was developed,and numerical simulation experiments were conducted on the non-axis double helix mixing device.This non-axis double helix mixing device provides technical support for the full hydration reaction between shotcrete material and water.Through on-site experiments,the dust concentration in the spraying operation area is between 8~10 mg/m 3,wet concrete spraying machine with a spraying capacity of 8 m 3/h.Compared to ordinary dry shotcrete machines,concrete prepared using wet shotcrete machines has a 65%increase in strength.Practice showed that the wet concrete spraying machine using a non-axis double helix mixing mechanism had significant improvements in improving spraying efficiency,strengthening the stress state of surrounding rock,and improving the working environment for workers.

关 键 词：湿式喷浆 无轴双螺旋 混凝土强度 水化反应 应力应变 

分 类 号：TD353.3[矿业工程—矿井建设]