| 输电线路工程预应力灌注桩防蚀设计及施工工艺 |
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| 作者姓名： | 谈磊 宁帅朋 韩丽婷 |
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| 作者单位： | 中国能源建设集团江苏省电力设计院有限公司,江苏 南京 211102;南京工业大学土木工程学院,江苏 南京 211800 |
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| 基金项目： | 江苏省产学研前瞻性联合研究项目(SBY20160-20488) |
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| 摘 要： | 盐渍土地区地下水腐蚀作用会严重降低输电线路工程桩基的耐久性。预应力灌注桩通过桩身增设预应力筋,采用有粘结后张法施加预应力,显著地改善了结构的耐久性。通过算例发现预应力筋的增设可以有效提高桩身裂缝控制等级,减少基础材料用量。采用复合材料护筒代替钢护筒,降低了工程造价,减少了现场工作量。本文给出了预应力灌注桩的设计方法、施工流程以及预应力钢筋笼的制作和力筋的张拉与锚固两项关键工艺的施工要点。
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| 关 键 词： | 灌注桩 强腐 预应力 玻璃钢护筒 施工工艺 |
| 收稿时间： | 2017/7/5 0:00:00 |
| 修稿时间： | 2017/8/31 0:00:00 |
Anti-corrosion Design and Construction Technology for Prestressed Cast-in-place Pile with Serious Corrosion in Transmission Line Towers |
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| Authors: | TAN Lei NING Shuaipeng HAN Liting |
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| Affiliation: | China Energy Engineering Group Jiangsu Power Design Institute Co., Ltd., Nanjing 211102, China; College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China |
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| Abstract: | Due to serious corrosion of ground water in saline soil area, the durability of pile foundation is seriously reduced in transmission line towers. Prestressed cast-in-place pile, which was reinforced with prestressing tendon in pile body and applied prestress by the post tension method, provides significant improvement in construction durability. Through numerical examples, it is found the additional prestressing tendon can effectively increase pile body crack-control level and reduce material dosage in foundations. The advantage of GFRP guard barrel replacing steel guard barrel are narrated with the reduction of the construction costs and the local workload. The design method of prestressed cast-in-place pile, construction process and manufacture method of prestressed steel cage with tensioning and anchoring constructions control points are recommend in the paper. |
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| Keywords: | cast-in-place pile serious corrosion GFRP guard barrel construction technology |
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