论文部分内容阅读
1.三门峡黄河公路大桥是由铁道部大桥局一处负责施工的,大桥主桥有五个由9φ1.8m 钻孔灌注桩组成的群桩基础。桥址主要地质为硬结粘土层、卵石层、以及粘土层中夹有胶结层,且局部胶结成岩。因此,采用“吸冲钻”联合成孔并以旋转钻为主的基础施工方案。所谓“吸冲钻”联合成孔,系指开钻前先用φ250mm 或φ450mm 吸泥机吸泥至护筒刃脚以上约2m 处,投粘土碎粒约1m,使之与孔内卵石混合,用冲击钻机以低冲程冲砸至刃
1. Sanmenxia Yellow River Highway Bridge is responsible for the construction of a bridge bureau of the Ministry of Railways, the bridge main bridge has five 9φ1.8m bored pile group pile foundation. The main geological site of the bridge is cemented clay layer, pebble layer, and the clay layer is sandwiched with cementing layer, and local cementing into rock. Therefore, the use of “suction drill ” into a hole and based on rotary drilling based construction program. The so-called “Suction Drill ” joint into the hole, means before drilling with φ250mm or φ450mm suction sucker suction to the casing edge above about 2m, throwing clay particles about 1m, so that the hole with pebbles Mix and hit the blade with a low impact stroke hammer