CAJ | 학술논문

马鞍山长江大桥南锚碇采用沉井基础,沉井入土深度超过50 m,其施工采用“3次接高,3次下沉”的工艺：第1次下沉采用降排水措施,第2次下沉采用半排水措施,第3次下沉采用不排水措施。在沉井第3次下沉过程中,开启空气幕助沉,显著加快了下沉速度。沉井下沉期间,采用综合监控手段,保证了沉井顺利、精确下沉。实践证明,该桥所采用的沉井下沉方案科学合理,下沉到位后沉井几何姿态良好。
마안산장강대교남묘정채용침정기출,침정입토심도초과50 m,기시공채용“3차접고,3차하침”적공예：제1차하침채용강배수조시,제2차하침채용반배수조시,제3차하침채용불배수조시。재침정제3차하침과정중,개계공기막조침,현저가쾌료하침속도。침정하침기간,채용종합감공수단,보증료침정순리、정학하침。실천증명,해교소채용적침정하침방안과학합리,하침도위후침정궤하자태량호。
Open caisson foundation is adopted for south anchor of Maanshan Yangtze River Bridge with the buried depth over 50 m, and its construction adopts technology of“jointing for three times and subsidence for three times”: the first subsidence employs dewatering and drainage, the second subsidence half-drainage and the third subsidence no drainage. During the third subsidence of the open caisson, air curtain is started to assist subsidence, speeding up subsidence remarkably. During subsidence of the open caisson, integrated monitoring means are adopted to guarantee smooth and accurate subsidence of the open caisson. The practice proves that the subsidence scheme of the open caisson adopted for the bridge is scientific and reasonable, and geometric profile of the open caisson after subsidence is in place is perfect.