CAJ | 학술논문

针对青藏高原察格高速公路穿越地下水较丰富沼泽区的特点,选择某简支梁桥12根直径为2.2 m桩径约为20 m的钻孔灌注桩施工过程为分析对象,对其关键技术逐一分析,并得到如下结果：钻孔桩穿越可液化土层时钻孔速度需控制在0.7 m/h左右,不同地质和不同层位可适当调整；桩基混凝土浇筑速度需控制在10 m/h左右,混凝土充盈系数平均值为1.069,远低于定额规定；泥浆与混凝土的配制方案经检测较适合该地区水下混凝土施工。同时,就钢筋笼上浮和井口钢筋笼焊接控制技术提出建议。
침대청장고원찰격고속공로천월지하수교봉부소택구적특점,선택모간지량교12근직경위2.2 m장경약위20 m적찬공관주장시공과정위분석대상,대기관건기술축일분석,병득도여하결과：찬공장천월가액화토층시찬공속도수공제재0.7 m/h좌우,불동지질화불동층위가괄당조정；장기혼응토요축속도수공제재10 m/h좌우,혼응토충영계수평균치위1.069,원저우정액규정；니장여혼응토적배제방안경검측교괄합해지구수하혼응토시공。동시,취강근롱상부화정구강근롱한접공제기술제출건의。
In allusion to the feature of Cha’ erhan-Ge’ ermu Expressway in Qinghai-Tibet Plateau crossing swamp area with rich underground water, this paper selects construction of 12 drilled grouting piles at diameter of approximate 2. 2 m and pile diameter of about 20 m of some simply supported beam bridge to analyze their critical techniques one after another and obtains the following results: as drilled piles cross liquefiable soil, the drilling speed should be controlled at approximate 0. 7 m/h, and can be properly adjusted for different geological conditions and positions; the pouring speed of pile foundation concrete should be controlled at about 10 m/h, and the average of filling coefficients of concrete is 1. 069, much lower than the specified quota;the preparation plan of mortal and concrete after detection is applicable to underwater concrete construction in this region. In the meantime the paper proposes recommendations for steel-reinforced cage up-floating and wellhead steel-reinforced cage welding control techniques.