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新乡地区,采用钻孔灌注桩修建公路桥梁,从今年3月底开始起截至7月底止,共修了3孔7.5米装配式钢筋混凝土桥4座,总长107.76米。桩径由0.6～0.8米两种组成,都是一墩两柱,每座桥用8个桩柱,深度14.5～19.5米,共钻32孔,累计深度480米,碰到过粘土、亚砂土、粉砂、细砂、粗砂及土夹姜石等地层。我们在施工中,根据土质软硬不同的特性,自己制造了大锅锥、狼牙锥和老虎头锥等锥具。经过反复试验,摸到了遇到什么土层应用什么锥具的规律。我们用单班18人工作15天内就完成一座桥的下部构造。每个钻孔从定位、埋护筒、钻孔、吊放钢筋骨架及灌注水下混凝土等工序,只用两天时间便可完成。
Xinxiang area, the use of bored piles to build roads and bridges, from the end of March this year until the end of July, a total of 3 holes 7.5 meters of prefabricated reinforced concrete bridge 4, a total length of 107.76 meters. The pile diameter is composed of two kinds of 0.6-0.8 meters. Both are one pier and two columns. Each bridge has 8 piles with a depth of 14.5-19.5 meters. A total of 32 holes are drilled. The accumulated depth is 480 meters. Soil, silt, fine sand, grit and soil folder ginger stone and other formations. We are in the construction, according to different characteristics of hard and soft soil, made their own cauldron cone, Spike cone and tiger cone and other cones. After repeated tests, touched what soil encountered what conic rule. We use a single class of 18 people to work within 15 days to complete the construction of the lower part of a bridge. Each drilling from the positioning, buried casing, drilling, lifting steel skeleton and pouring underwater concrete and other processes, only two days time can be completed.