
长距离输水工程压力管道地埋镇墩标准化设计
刘世伟, 杨捷, 卢小波
长距离输水工程压力管道地埋镇墩标准化设计
Standardized Design of Underground Anchor Block for Penstock in the Long-distance Water Conveyance Project
针对压力管道地埋镇墩设计中存在的问题,综述了国内外管道镇墩设计的研究现状与进展,提出了适用于长距离输水工程压力管道地埋镇墩的标准化设计方法,推导了不同类型地埋镇墩结构尺寸及稳定计算公式,探讨了压力管道地埋镇墩抗滑稳定计算公式的选取及是否考虑被动土压力的问题。分析确定了大小转角地埋镇墩的界限角为30°。外包混凝土厚度b是确定地埋镇墩尺寸的控制性参数,不应小于0.5 m。目前,该方法已在多个压力管道工程地埋镇墩设计中得到应用,结果表明此方法设计的地埋镇墩不仅布局合理,工作性能可靠,而且大大提高了设计效率和精度。
According to the current existing problems of underground anchor block for penstock, the status and progress of the study on anchor block design at home and abroad are reviewed. Standardized design method is put forward in the long-distance water conveyance project. Calculation formula of structural dimension and anti-sliding stability are deduced for the several different types of underground anchor block. The selection of formula of anti-sliding stability is discussed and whether the passive earth pressure is considered in the formula. The critical angle is used to distinguish the high-turning angle and small-turning angle for underground anchor block. In this paper, the critical angle of 30 is deduced. The reasonable design of underground anchor block structural type need cyclic debug process and the value “b” of the thickness of lined reinforced concrete penstock is the key controlling parameter for structural dimension of underground anchor block. Based on relevant literature and engineering experience, the value “b” should be not less than 0.5 meters. Successful application of this standardization design method in several penstock projects shows that it is reasonable and practical, and a big improvement has been made in the design of underground anchor block.
长距离输水工程 / 地埋镇墩 / 标准化设计 / 被动土压力 / 外包混凝土厚度 / 抗滑稳定 {{custom_keyword}} /
long-distance water conveyance project / underground anchor block / standardized design / passive earth pressure / thickness of lined reinforced concrete penstock / anti-sliding stability {{custom_keyword}} /
图5 大转角平面镇墩受力分析计算平面图Fig.5 Plane figure of forces acting on plane anchor block(big angle) |
表1 石门河调蓄引水灌溉管道工程立面镇墩特性表Tab.1 Properties of elevation anchor block of irrigation pipeline for the project of Shimen river |
编号 | 桩号/m | 压力水头Fwd /m | 止推力P/t | 镇墩立面型式 | 弯管类型 | 设计纵坡i/% | 角度α/(°) | 角度 β/(°) | 圆心角 γ/(°) | 镇墩拟定尺寸/m (长L×宽B×高H) | 衬砌厚度b/m | 镇墩体积V/m3 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
LM1 | 0+544.19 | 188.09 | 7.90 | Ⅰ类 | 下行弯管 | -16.22 | 9.21 | 1.77 | 10.98 | 2.0×1.9×2.1 | 0.70 | 7.54 |
LM2 | 1+385.29 | 161.83 | 8.18 | Ⅳ类 | 下行弯管 | 1.77 | 1.02 | 14.23 | 13.21 | 1.8×2.0×2.3 | 0.75 | 8.11 |
LM3 | 1+454.88 | 170.90 | 13.14 | Ⅰ类 | 下行弯管 | 0.00 | 0.00 | 20.16 | 20.16 | 2.5×2.5×2.5 | 1.00 | 15.33 |
LM4 | 2+792.46 | 87.50 | 8.37 | Ⅰ类 | 下行弯管 | -1.20 | 0.69 | 24.46 | 25.14 | 2.4×2.3×2.3 | 0.90 | 12.52 |
LM5 | 2+932.10 | 102.14 | 5.95 | Ⅰ类 | 下行弯管 | 0.00 | 0.00 | 15.23 | 15.23 | 1.8×1.9×1.9 | 0.70 | 6.27 |
表2 石门河调蓄引水灌溉管道工程平面镇墩特性表Tab.2 Properties of plane anchor block of irrigation pipeline for the project of Shimen river |
编号 | 桩号/m | 压力水头Fwd /m | 水平止推力P 0/t | 设计纵坡i/% | 角度α/(°) | 角度 β/(°) | 平面圆心角θ/(°) | 镇墩设计尺寸/m (长L 1×长L×宽B×高H) | 衬砌厚度b/m | 镇墩混凝土体积/m3 |
---|---|---|---|---|---|---|---|---|---|---|
PM1 | 0+306.82 | 200.10 | 15.56 | -0.18 | 0.10 | 0.10 | 25.56 | 1.99×2.58×2.93×2.93 | 1.20 | 28.81 |
PM2 | 0+900.42 | 188.09 | 2.86 | -0.88 | 0.50 | 0.50 | 21.19 | 0.82×1.48×1.93×2.19 | 0.70 | 6.31 |
PM3 | 1+158.12 | 169.70 | 2.84 | -0.34 | 0.19 | 0.19 | 22.04 | 0.83×1.49×1.93×1.98 | 0.70 | 5.69 |
PM4 | 1+299.81 | 163.87 | 9.22 | -11.12 | 6.34 | 6.34 | 31.10 | 1.46×2.18×2.53×2.55 | 1.00 | 16.39 |
PM5 | 2+114.64 | 102.16 | 12.16 | -11.17 | 6.38 | 6.38 | 69.39 | 1.73×2.40×2.73×2.75 | 1.10 | 22.26 |
PM6 | 2+162.03 | 96.64 | 4.13 | -11.17 | 6.38 | 6.38 | 72.82 | 0.99×1.71×2.13×2.15 | 0.80 | 8.15 |
PM7 | 2+350.29 | 86.13 | 10.99 | 0.50 | 0.28 | 0.28 | 24.50 | 1.67×2.38×2.73×2.75 | 1.10 | 21.67 |
PM8 | 2+384.75 | 86.15 | 11.40 | 0.50 | 0.28 | 0.28 | 45.90 | 1.76×2.40×2.73×2.74 | 1.10 | 22.38 |
PM9 | 2+486.70 | 86.23 | 15.44 | 0.50 | 0.28 | 0.28 | 28.13 | 2.16×2.60×2.93×3.32 | 1.20 | 34.93 |
PM10 | 2+574.05 | 88.88 | 20.44 | 5.70 | 3.26 | 3.26 | 42.02 | 3.43×2.53×2.73×3.25 | 1.10 | 46.60 |
PM11 | 2+699.81 | 89.00 | 20.16 | -1.20 | 0.69 | 0.69 | 50.25 | 3.41×2.48×2.53×3.04 | 1.00 | 40.47 |
PM12 | 2+754.49 | 88.11 | 6.42 | -1.20 | 0.69 | 0.69 | 26.87 | 1.59×2.11×2.33×2.34 | 0.90 | 14.54 |
PM13 | 2+802.41 | 91.98 | 11.81 | 45.49 | 24.46 | 24.46 | 26.94 | 2.38×2.42×2.53×2.55 | 1.00 | 24.57 |
PM14 | 4+360.73 | 61.88 | 2.95 | 34.58 | 19.08 | 19.08 | 27.48 | 0.88×1.42×1.73×1.74 | 0.60 | 4.52 |
表3 石门河调蓄引水灌溉管道工程复合镇墩特性表Tab.3 Properties of composite anchor block of irrigation pipeline for the project of Shimen river |
编号 | 桩号/m | 计算内水压力水头Fwd /m | 水平止推力P 0/t | 竖向止推力P/t | 设计纵坡i/% | 竖向圆心角γ/(°) | 平面圆心角θ/(°) | 复合圆心角Δ/(°) | 镇墩拟定尺寸/m (长L 1×长L×宽B×高H) | 衬砌厚度b/m | 镇墩砼体积/m3 |
---|---|---|---|---|---|---|---|---|---|---|---|
FH1 | 0+152.16 | 201.22 | 19.39 | 0.43 | 0.79 | 0.55 | 25.34 | 25.34 | 1.89×2.40×2.93×2.94 | 1.20 | 27.12 |
FH2 | 0+672.36 | 191.34 | 13.41 | 1.66 | 3.08 | 2.27 | 18.35 | 18.49 | 1.58×2.24×2.73×2.78 | 1.10 | 20.57 |
FH3 | 1+019.03 | 186.40 | 4.33 | 14.68 | -0.88 | 20.65 | 6.06 | 21.48 | 0.62×1.09×1.53×1.76 | 0.50 | 2.92 |
FH4 | 1+059.35 | 170.58 | 2.37 | 13.63 | -38.69 | 20.96 | 3.63 | 21.25 | 0.57×1.05×1.53×1.75 | 0.50 | 2.72 |
FH5 | 1+630.39 | 120.97 | 26.39 | 2.96 | -4.29 | 6.39 | 59.55 | 59.86 | 2.95×2.20×2.93×3.16 | 1.20 | 40.27 |
FH6 | 1+839.42 | 129.57 | 23.37 | 2.24 | -0.99 | 4.51 | 48.47 | 48.64 | 2.57×2.29×2.93×3.08 | 1.20 | 35.50 |
FH7 | 2+252.55 | 86.10 | 7.96 | 2.20 | -11.17 | 6.66 | 24.30 | 25.15 | 1.49×1.94×2.33×2.47 | 0.90 | 14.27 |
FH8 | 3+039.47 | 85.23 | 1.40 | 5.33 | -3.20 | 16.36 | 4.27 | 16.90 | 0.80×1.45×1.93×2.15 | 0.70 | 6.01 |
FH9 | 3+459.15 | 85.30 | 6.63 | 1.83 | -6.92 | 5.61 | 20.37 | 21.12 | 1.28×1.76×2.13×2.24 | 0.80 | 10.16 |
FH10 | 3+940.20 | 30.42 | 2.42 | 1.01 | -2.75 | 10.66 | 25.59 | 27.64 | 0.99×1.28×1.48×1.63 | 0.50 | 3.84 |
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