一种新型封堵墙拆除施工工艺研究及应用
Research and Application of a New Construction Technology of Wall Removal

深基坑中的封堵墙拆除通常为整体拆除，而在上海机场联络线华泾站基坑的封堵墙拆除中，涉及了顶部封堵墙保留，下部封堵墙先行拆除工况。为保证顶部悬吊封堵墙稳定，采取了一系列维稳措施；在拆除悬吊封堵墙时，选用绳锯切割，细化切割步序。最后，加强封堵墙沉降监测。研究表现：通过保留悬吊封堵墙段的混凝土支撑、圈梁，并采取增设混凝土对撑、斜抛型钢撑、保留地墙H钢接头、与已完结构板增加钢性连接等措施，可保持封堵墙稳定。在拆除悬吊封堵墙时，架设钢支撑、先拆两侧保留跨中等方式也可有效控制封堵墙沉降，可将悬吊封堵墙沉降控制在12 mm以内。文章将对该新型封堵墙拆除施工工艺进行详细介绍，以期对后续类似工程起到借鉴引导作用。
The removal of the sealing wall in deep foundation pits is usually done as a whole, while the removal of the sealing wall in the Huajing Station foundation pit of the Shanghai Airport connecting line, involves retaining the top sealing wall and removing the lower sealing wall first. A series of stability maintenance measures have been taken to ensure the stability of the suspended sealing wall at the top. When dismantling the suspended blocking wall, use a rope saw to cut and refine the cutting steps. Finally, the monitoring of the settlement of the sealing wall must be strengthened. Research findings: By retaining the concrete support and ring beam of the suspended sealing wall section, and taking measures such as adding concrete counter braces, inclined steel braces, retaining the H-steel joint of the ground wall, and adding steel connections to the completed structural slab, the stability of the sealing wall can be maintained. When dismantling the suspended sealing wall, setting up steel supports and removing the middle span on both sides can effectively control the settlement of the sealing wall. The settlement of the suspended sealing wall can be controlled within 12 mm. The article will provide a detailed introduction to the demolition construction process of this new type of sealing wall, in order to provide reference and guidance for similar projects in the future.