某在建度假村地下室混凝土裂缝的现场调查及检测分析

Site Investigation and Testing on Basement Concrete Cracks of a Resort during Construction

针对某温泉度假村地下室工程在施工期间出现整体上浮,地下室部分底板和顶板出现裂缝,采用现场调查及检测的方式对结构进行了安全评价分析。主要对构件间距和尺寸进行了检查;对混凝土构件钢筋进行检测;对构件混凝土抗压强度进行抽检;对梁板高程和柱子垂直度、裂缝的长度、宽度和深度进行了检测分析;采用地质雷达推定地下室底板空鼓情况;对建筑抗浮进行验算。结果表明:1) 地下室整体不均匀上浮,整体上向南西方向倾斜,抗浮不满足设计要求,是导致事故的主要原因。2) 柱构件轴线位置偏差较大,墙构件钢筋间距不达标,构件截面尺寸不符合标准,导致构件出现局部应力集中,为事故的次要原因。3) 建议对地下室整体进行纠偏后加固,严格落实施工中的保证结构安全性的施工措施。

In response to the overall uplift of a hot spring resort basement project during construction and cracks in part of the basement floor and roof slab, a safety evaluation analysis of the structure was conducted by means of on-site investigation and testing. The spacing and size of the members were mainly inspected;the reinforcement of concrete members was tested;the compressive strength of the concrete of the members was sampled;the beam slab elevation and column verticality, the length, width and depth of cracks were tested and analyzed;geological radar was used to presume the hollow bulge of the basement bottom slab;and the building floatation resistance was tested and calculated. The results showed that: 1) The basement as a whole was unevenly floated and tilted to the south-west direction as a whole, and the anti-floating did not meet the design requirements, which was the main cause of the accident. 2) The deviation of the axis position of the column members is large, the spacing of the reinforcement of the wall members is not up to standard, and the cross-sectional size of the members does not meet the standard, resulting in local stress concentration in the members, which is the secondary cause of the accident. 3) It is suggested that the basement as a whole should be reinforced after correcting the deviation, and the construction measures to ensure structural safety during construction should be strictly implemented.