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1 井管的受力状态混凝土井管适用于井深小于100m的浅管井,一般井壁管不加构造钢筋,单节长1m,井管外径300～500mm,壁厚30～50mm。正常运行工况下,井管受自重及其上部井管重量产生的压力,水及土的侧压力。1.1 竖向受力分析对于浅管井,一般施工要求井孔斜度小于1°,所以竖向按圆形截面的平面受压构件考虑。其受压承载力按下式计算:σ=αN/((?)A_c)(1)式中σ为井管自重产生的应力MPa;α为动力系数;N为轴向力设计值(kN);(?)为素混凝土构件的稳定系数,一般来说,L/d<4,取1.0;A_c为混凝土受压区截面面积m~2。
1 Well tubular stressed concrete well pipe is suitable for shallow wells with a well depth of less than 100m. Generally, the wellbore tubular pipe is constructed without reinforcing steel bars. The single section length is 1m. The external diameter of the well pipe is 300 to 500mm and the wall thickness is 30 to 50mm. Under normal operating conditions, the well tube by weight and the weight of the upper well tube pressure, water and soil lateral pressure. 1.1 Vertical Force Analysis For shallow tube wells, the general construction requirements wellbore slope is less than 1 °, so the vertical plane pressure by the circular cross-section of the compression member to consider. The compressive bearing capacity is calculated as follows: σ = αN / ((?) A_c) (1) where σ is the stress generated by the weight of the well pipe MPa; α is the dynamic coefficient; N is the design value of axial force (?) Is the stability coefficient of concrete element, in general, L / d <4, take 1.0; A_c is the concrete compression section area m ~ 2.