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矿井排水管的管壁厚度,一般常用下式计算:式中 d——管壁厚度,厘米 D——管子内径,厘米 ——许用应力,钢管为800公斤/厘米~2,铸铁管为200公斤/厘米~2 P——管内水压力,公斤/厘米~2 ——水泵排水的测定高度,米 a——附加厚度,铸铁管为0.7～0.9厘米,钢管为0.1～0.2厘米 本文建议,采用钢管排水时可按下式进行计算: 一、式子的推导 1.受拉试件斜截面上的剪应力:塑性材料拉伸时(图1),随着力P的逐渐增大试件逐步变细,并出现一条条与力P成45°角
The thickness of the wall of the mine drainage pipe is generally calculated by the following formula: where d is the thickness of the pipe wall, cm D is the inner diameter of the pipe, and the centimeter is the allowable stress, the steel pipe is 800 kg/cm~2, and the cast iron pipe is 200 Kg / cm ~ 2 P - pipe water pressure, kg / cm ~ 2 - measured height of the pump drainage, m a - additional thickness, cast iron pipe is 0.7 ~ 0.9 cm, steel pipe is 0.1 ~ 0.2 cm When the steel pipe is drained, it can be calculated as follows: 1. Derivation of the formula 1. Shear stress on the oblique section of the tensile specimen: When the plastic material is stretched (Fig. 1), the specimen gradually changes as the force P increases. Fine, and a bar appears at a 45° angle to force P