土工基础

›› 2014, Vol. 28 ›› Issue (4): 66-69.

• 工程实录 • 上一篇    下一篇

格栅连续墙“两墙合一”设计方法与连接构造

杨 博1，孙邦宾2,郭 彤1,3，宋永生1,3，卫龙武1,姚 兵2   

  1. （1.江苏鸿基科技有限公司，南京 210008；2.淮安市民防局，江苏淮安 223002;
    3.东南大学混凝土及预应力混凝土结构教育部重点实验室，南京 210096）
  • 收稿日期:2013-03-26 出版日期:2014-08-20 发布日期:2014-08-27
  • 作者简介:杨博（1988-），男，助理工程师，研究方向为岩土工程。
  • 基金资助:

    基金项目：江苏省建设厅项目（2013JH07）

Design and Connection Details of a Grid Diaphragm Wall

YANG Bo1, SUN Bangbin2, GUO Tong1,3, SONG Yongsheng1,3, WEI Longwu1, YAO Bing2
   

  1. (1.Jiangsu Hongji Science & Technology Co., Ltd, Nanjing 210008; 2. Civil Defense Bureau of Huai'an, Huai'an, 223002;
    3. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096)
  • Received:2013-03-26 Online:2014-08-20 Published:2014-08-27

摘要： 格栅状地下连续墙是通过连续沉模成孔，在孔中先后放置钢筋笼和浇筑混凝土而最终成墙，可兼作基坑支护结构和地下室外墙。结合格栅状地下连续墙“两墙合一”功能需求，分别针对支护阶段、竣工阶段和使用阶段开展了墙体受力分析研究，建立了格栅状地下连续墙“两墙合一”计算方法，提出了与地下室结构节点构造和防渗漏构造措施。研究表明：水土压力由施工阶段的主动压力变为使用阶段的静止压力，而地下水位则恢复至静止水位。墙体与楼板（底板）、梁可采取弯折接驳器或焊接等方式增强连接的可靠性。针对连续墙墙身、墙顶与压顶圈梁接缝和与底板接缝等位置，应分别采用满足强度等级和主体结构防渗要求的混凝土浇筑、设置抗剪块和止水钢板并辅以防水卷材或防水涂料，以及设置遇水膨胀橡胶止水条并灌注亲水性环氧浆液等防渗漏措施。研究结果可为格栅状地下连续墙“两墙合一”设计和施工提供参考。

关键词: 格栅状地下连续墙, 两墙合一, 设计方法, 节点构造, 防渗措施

Abstract: The grid diaphragm wall is constructed by continuously sinking the steel forms into the soil, placing the reinforcement bars and concreting the grid. This new type of wall can serve as the supporting structure during the deep excavation and also as the exterior wall of the future basement. The grid diaphragm wall combines the functions of both supporting and the structural walls. This paper presents the evaluation results of this wall in various phases: during the supporting in deep excavation, immediately after construction and operation. The stress distributions in the wall at various stages are analyzed. The connection joint and seepage cutoff details are also presented. The results show that the active earth pressures during the construction was translated into atrest earth pressure in the operation and the groundwater is restored to the static water table. The moment connectors welding connections can be used at connections between wall and floor (bottom slab), wall and beam so that the reliability of these connections can be improved. For the body of the diaphragm wall, wall and beam connections, wall and bottom slab joints, seepage resistant concrete, shear stiffeners and seepage cutoff steel plates can be applied in combination with seepage prevent materials of paint. Other seepage cutoff measures such as, expansive rubber seepage stop strips and water based epoxy grouting, can also be applied. The above results can provide technical references for the future design and construction of the grid diaphragm walls.

Key words: Grid Diaphragm Walls, Dual Purpose Diaphragm Walls, Design Methods, Joint Details, Seepage Cut-off Measures