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根据多年来在东北佳木斯等地区的实践中所取得的经验教训,认为对大口井的较好做法是:(1)较高的钢板刃脚和截头圆锥外型。钢板刃脚可做成厚约10毫米,净高约0.5米,脚下边缘用乙炔切割器切成刀刃形,便于切割较大的河卵石或倒木等障碍物。截头圆锥做成由下向上的坡度,井下沉时,井外土壤不受扰动,井壁与砂层间产生小缝隙,可及时用砂、砾石填充,这样摩擦力减少,比圆柱型和阶梯型井筒下沉容易,效果也好。一般可达到20～30米深。但其坡度不宜过大,以取3～5％为宜。(2)井筒施工可
According to the experience gained in the practice of Northeast Jiamusi and other regions for many years, it is considered that the better practices for large-bore wells are: (1) Higher plate edge and truncated cone profile. The edge of the steel plate can be made into a thickness of about 10 millimeters and a net height of about 0.5 meters. The lower edge of the foot is cut into a blade shape with an acetylene cutter, which is convenient for cutting larger obstructions such as river pebbles or falling wood. The truncated cone is made up from the downward slope. When the well sinks, the soil outside the well is undisturbed. Small gaps between the well wall and the sand layer can be filled with sand and gravel in time. This reduces the friction, compared to the cylinder and the ladder. Wellbore sinking is easy and the effect is good. Generally reach 20 to 30 meters deep. However, its slope should not be too large, taking 3 ~ 5% is appropriate. (2) Wellbore construction may