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随着预应力施工技术在建筑、桥梁等领域的广泛应用,施工过程中的各种质量事故也时有出现。本文就某工程十八米预应力混凝土现浇框架梁在施工过程中出现裂缝事故,探讨和分析裂缝产生原因及怎样对其进行加固处理。 一、工程概况 该工程主楼为16层框剪结构的综合办公楼,附楼为3层钢筋混凝土框架结构,其使用功能为食堂、礼堂和餐厅。B、D、F轴设计为后张预应力梁与柱整体浇筑,梁跨距为18m。梁截面400×1000mm,钢铰线设计采用7φj5,f_(plk)=1470N/mm~2,实际用1570N/mm~2,锚具采用QM群锚。砼设计强度为C35,施工单位在张拉前拆除梁侧模板时,发现梁跨中部位出现竖向裂缝,遂请有关检测部门对其进行检测。
With the extensive application of prestressed construction technology in buildings, bridges and other fields, various quality accidents in the construction process have also appeared from time to time. In this paper, the 18-meter prestressed concrete cast-in-place frame beam of a project is cracked during the construction process, and the causes of cracks are analyzed and analyzed, and how to reinforce it. I. General situation of the project The main building of the project is a 16-storey frame-shear structure integrated office building, and the annex building is a 3-story reinforced concrete frame structure. Its functions are cafeterias, auditoriums and restaurants. The B, D and F shafts are designed for post-tensioned pre-stressed beams and columns with a span of 18m. Beam cross-section 400 × 1000mm, steel hinge line design using 7φj5, f_(plk) = 1470N/mm~2, actual use of 1570N/mm~2, anchor QM group anchor.砼 The design strength was C35. When the construction unit dismantled the beam side formwork before tensioning, it was found that there was a vertical crack in the middle part of the beam, and the relevant inspection department was asked to test it.