小型注浆钢管桩在水塔地基加固中的应用

柳钢转炉水塔因场地面侧进行人工挖孔桩施工，大量抽排地下水，导致水塔地基出现不均匀沉降，水塔向西南方向产生倾斜，在水塔圆板基础下布设30根直径130mm钻孔，孔深入岩约2．5m，孔内下直径108mm，壁厚4.5mm的钢管，钢管内外再灌注水泥浆，形成注浆钢管桩，进行加固处理，完工11d后，水塔累计沉降量为2mm，倾斜3mm，后来挖孔桩重新施工排水过程中，该水塔水未发生沉降和倾斜。

Application of small grouting steel tube pile to water-tower foundation reinforcement

Because borehole cast_in_place piles and large numbers of groundwater in the westward of a converter water_tower in Liuzhou steel factory,the water_tower foundation occurs asymmetrical settlement and tilt toward southwest. The reinforcing goal is how to keep the water_tower from tilting. It's suggested that the C10 rubble_stone concrete with 5m thick below the water_tower base is a rigidity, the load of water_tower (filling water) is summons the C10 rubble_stone concrete by the water_tower foundation. It stabilizes the C10 rubble_stone concrete and prevents water_tower from tilting as long as adequate steel tube piles are collocated to make vertical bearing capacity of steel tube pile down_part exceed the water_tower load and make an anchor_hold between the up_part steel tube pile and C10 rubble_stone. Thirty drills with a diameter of 130 mm are chiseled into 2 5 m below the water_tower foundation. The steel tubes with a diameter of 108 mm and 4 5 mm thick are put into the drills, and the cement_slurry is grouted around the steel tube inside and outside. After this reinforcing way, the water_tower total settlement is 2 mm,the tilt is 3 mm.It stands the testing of borehole cast_in_place piles digging and groundwater pumping. Practice proves this way is successful and can be used in similar case.