煤矿井下干混砂浆吨包的应用

Application of Dry Mixed Mortar Ton Pack in Coal Mine Underground

在矿山井巷,采用与锚杆支护相结合的喷射混凝土支护,是将水泥、砂、石、按一定的比例混合搅拌后,送入混凝土喷射机中,用压缩空气将干拌合料压送到喷头处,在喷头的水环处加水后,高速喷射到巷道围岩表面,起支护作用的一种支护形式和施工方法[1]。煤矿井下利用干混砂浆,将减少井下喷浆作业工人,能取消井下现场人工卸料、拌料、上料工作流程。使用干混砂浆(沙子、水泥)后,两个人利用单轨吊,将干混砂浆吨包吊起,通过吨包下料口,流入喷浆机上料口即可操作完成。众所周知含土量高的沙子,搅拌混凝土不结实,影响施工质量,泥土量超过3%的沙子要经过处理,所以,干混砂浆制作过程中,除尘系统将烘干过程中沙子里的土排走,提高了沙子的纯度,使用干粉砂浆喷射混凝土的强度高于井下现场人工搅拌沙子水泥混凝土强度。

In mining tunnels,shotcrete support combined with anchor rod support is adopted.Cement,sand,stone are mixed and mixed in a certain proportion,and then sent to a concrete sprayer.Compressed air is used to press the dry mixture to the nozzle.After adding water to the water ring of the nozzle,it is sprayed at high speed onto the surface of the surrounding rock of the tunnel to provide support.The use of dry mixed mortar underground in coal mines will reduce the number of workers involved in underground spraying operations and eliminate the manual unloading,mixing,and loading processes on-site.After using dry mixed mortar(sand,cement),two people use a monorail crane to lift the dry mixed mortar ton pack,which flows into the feeding port of the spraying machine through the feeding port of the ton pack to complete the operation.As is well known,sand with high soil content is not strong enough to mix concrete,which affects construction quality.Sand with soil content exceeding 3%needs to be treated.Therefore,during the production process of dry mixed mortar,the dust removal system removes the soil in the sand during the drying process,improving the purity of the sand.The strength of using dry powder mortar to spray concrete is higher than that of manually mixing sand and cement concrete underground.