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杆柱支护应保证所维护的岩石暴露面有足够稳定性,同时应尽量少增加回采费用。支护效果越好,成本就越低。钢筋水泥砂浆杆柱支护成本包括凿岩费用、水泥充填和金属杆柱安装费用。减少孔径可降低凿岩和水泥费用。使用优质钢可以减小钢筋断面,而不降低其强度。但是由于钢筋水泥砂浆杆柱中的水泥砂浆与孔壁和钢筋相粘结,这样缩小钢筋和钻孔的直径势必会引起粘结表面缩小,从而导致杆柱强度的降低。可用增加粘着力的办法,保持杆柱必需的强度。也就是增加钢筋和水泥砂浆、
Pole support should ensure that there is sufficient stability of the rock exposed surface, while minimizing the cost of recovery. The better the support effect, the lower the cost. Reinforced concrete mortar column support costs include rock drilling costs, cement filling and metal pole installation costs. Reducing the hole diameter reduces rock drilling and cement costs. The use of high-quality steel can reduce the bar section, without reducing its strength. However, since the cement mortar in the reinforced cement mortar rod is bonded with the hole wall and the reinforcing steel bar, the reduction of the diameter of the reinforcing steel bar and the drilling hole will inevitably cause the bonding surface to be reduced, resulting in the decrease of the strength of the pole. Can increase the adhesion method, to maintain the necessary strength of the pole. Which is to increase steel and cement mortar,