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在瑞典用混凝土顶板杆柱支护坑内大硐室顶板很普遍,同时实践证明是成功的。在应用方面有三种型式: 1.安装杆柱后灌水泥浆; 2.混凝土胶结顶板杆柱; 3.预应力混凝土顶板杆柱; 第一种型式由于灌浆手续较复杂,使用还不广泛。第二种型式先把水泥灰浆压人钻孔内,再插人钢杆体,应用很广泛。压人水泥灰浆用二.种金属管或手提泵。用手提泵时,先插人塑料管把灰浆压人
In Sweden it is common to use large roof posts in concrete pits to hold large chamber roofs, and practice has proved successful. There are three types of applications: 1. Pillar installation after the irrigation mud; 2. Concrete cemented roof pole; 3. Prestressed concrete roof pole; The first type of filling process due to the more complex and not widely used. The second type of first cement mortar pressure drilling, and then inserted into the steel body, the application is very wide. Pressure man-made cement mortar with two kinds of metal pipe or portable pump. When using a portable pump, insert a plastic tube to press the plaster first