270土被り（ｍ）容量及び型式記号1T40-Ⅰ-A-0.0/1.02T40-Ⅰ-A-1.0/1.53T40-Ⅰ-A-1.5/2.34T40-Ⅱ-A-0.0/1.05T40-Ⅱ-A-1.0/1.66T40-Ⅲ-A-0.0/1.57T40-Ⅰ-B-0.0/1.08T40-Ⅰ-B-1.0/1.59T40-Ⅱ-B-0.1/1.010T40-Ⅰ-C-0.0/2.311T40-Ⅱ-C-0.0/2.312T40-Ⅲ-C-0.1/2.313T60-Ⅰ-A-0.0/1.014T60-Ⅰ-A-1.0/1.515T60-Ⅱ-A-0.0/1.016T60-Ⅱ-A-1.0/1.517T60-Ⅲ-A-0.0/1.518T60-Ⅰ-B-0.0/1.019T60-Ⅰ-B-1.0/1.520T60-Ⅱ-B-0.1/1.021T70-Ⅰ-A-0.0/1.022T70-Ⅰ-A-1.0/1.523T70-Ⅱ-A-0.0/1.024T70-Ⅱ-A-1.0/1.525T70-Ⅲ-A-0.0/1.526T70-Ⅰ-B-0.0/1.027T70-Ⅰ-B-1.0/1.528T70-Ⅱ-B-0.1/1.029T80-Ⅰ-A-0.0/1.030T80-Ⅰ-A-1.0/1.531T80-Ⅱ-A-0.0/1.032T80-Ⅱ-A-1.0/1.533T80-Ⅲ-A-0.0/1.534T80-Ⅰ-B-0.0/1.035T80-Ⅰ-B-1.0/1.536T80-Ⅱ-B-0.1/1.037T90-Ⅰ-A-0.0/1.038T90-Ⅰ-A-1.0/1.539T90-Ⅱ-A-0.0/1.040T90-Ⅱ-A-1.0/1.541T90-Ⅲ-A-0.0/1.542T100-Ⅰ-A-0.0/1.043.645.347.148.950.752.554.356.157.859.661.443T100-Ⅰ-A-1.0/1.544T100-Ⅱ-A-0.0/1.070.942.744.546.348.049.851.653.455.257.058.858.860.662.464.266.067.845T100-Ⅱ-A-1.0/1.546T100-Ⅲ-A-0.0/1.541.943.645.447.249.050.852.654.356.157.959.761.563.365.166.968.647T100-Ⅰ-B-0.0/1.048.450.151.953.755.557.359.160.962.764.566.348T100-Ⅰ-B-1.0/1.549T100-Ⅱ-B-0.1/1.040㎥60㎥70㎥80㎥90㎥100㎥0.00.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.344.846.548.350.251.953.855.657.459.261.062.852.053.855.657.459.261.162.964.766.568.370.154.256.057.859.761.463.365.166.968.770.572.374.175.977.779.681.450.151.953.755.657.459.261.062.864.666.568.362.364.266.067.869.671.473.275.076.978.746.147.849.651.553.255.156.958.760.562.364.165.967.769.571.373.274.976.878.680.482.284.085.887.652.153.955.757.559.361.162.964.766.568.370.272.073.875.677.479.281.082.884.686.488.290.191.893.755.957.759.561.363.164.966.768.570.372.274.075.877.679.481.283.084.886.688.490.392.193.995.744.145.947.749.551.353.154.956.658.560.362.145.947.749.551.353.154.956.758.560.362.163.954.055.857.659.461.263.064.866.668.470.243.945.747.549.351.152.954.756.458.260.061.844.245.947.749.551.353.154.956.758.560.362.151.753.555.357.158.960.762.564.366.167.943.845.547.349.150.952.754.556.358.159.961.742.844.646.448.250.051.853.555.357.158.960.750.551.853.655.457.259.060.862.664.466.243.745.447.249.050.852.654.456.257.959.761.541.843.545.347.148.950.752.554.356.057.859.648.850.652.454.155.957.759.561.363.164.963.164.966.868.570.472.270.272.073.875.677.479.281.068.670.472.274.075.877.762.464.266.067.769.571.364.065.867.669.471.273.047.549.251.052.854.656.458.260.061.863.665.467.269.070.872.674.449.050.852.654.456.258.059.861.663.465.267.067.369.170.972.774.576.362.163.965.767.569.371.162.264.065.867.569.371.145.547.349.150.952.654.456.258.059.861.663.465.267.068.870.672.448.850.552.354.155.957.759.561.363.164.966.767.068.870.672.474.276.062.063.865.667.369.170.9B：土被り荷重（kN）60.862.664.466.167.969.744.045.847.649.351.152.954.756.558.360.161.963.765.567.269.070.848.550.352.153.955.757.559.361.162.964.666.466.768.570.372.173.975.561.863.665.467.269.070.859.761.563.365.166.968.642.844.646.448.249.951.753.555.357.158.960.762.564.366.067.869.661.763.565.367.168.970.766.368.370.171.973.775.572.374.075.977.779.581.383.184.986.7・ピット部材PH500を２個使用の場合・60㎥、70㎥は、中間ボックスＴ部材使用の場合必要地耐力必要地耐力の算出は、次の式により求める。（必要地耐力）＝（鉛直荷重） （接地面積） ＝ B＋C＋D＋E＋F AA：接地面積（㎡） ＝水槽幅（ｍ）×水槽長（ｍ） ＝接地面積（㎡）×土被り厚（ｍ）×土の単位体積重量 （17.7kN/㎡）C：上載荷重（kN）→Ⅰ型の場合 ＝接地面積（㎡）×10（kN/㎡）D：交通荷重（kN）→Ⅱ、Ⅲ型の場合 自動車２台の後輪直載の場合について検討する。 交通荷重（kN）＝自動車荷重（kN）×0.4×2×1.3×2 （自動荷重T-25の場合、低減係数0.9を乗ずる。）E：本体質量（kN） 本体、端面、ピット、調整用部材の製品重量合計F：貯水質量（kN） ＝水槽の実容量（㎥）×水の単位体積重量（9.8kN/㎥）単位（KN／㎡）■必要地耐力（全国用）HC式防火水槽・HC式耐震性貯水槽
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