地下连续墙用方形锤头的设计及应用

Design and application of the square diaphragm wall chisel

方形锤头是地下连续墙成槽施工的重要钻具,本文简要介绍了一种新型地下连续墙方形锤头的结构设计、施工工法及应用情况。新型方形锤头整体框架采用焊接而成,结构合理,尺寸可根据用户需要优化调整,且具有导向性好、单位面积冲击功高、过水面积大和方便打捞等优点。锤头研制成功后,配合冲击反循环钻机,采用气举反循环工艺,先后在厦门、深圳等多个城市地铁工地施工,施工效率明显,取得了良好的经济效益和社会效益。新型方形锤头的研制成功,为地下连续墙成槽施工提供了一种更优的钻具选择。

The square chisel is an important trench cutting tool for the underground diaphragm wall.This paper briefly introduces the structural design,construction method and application of a new square chisel.The integral frame of the new square chisel is welded with proper structure,and its size can be adjusted according to the needs of users.It has the advantages of good guidance,large water passage,high impact power per unit area and ease for fishing.After the successful development of the chisel,it has been used on percussive reverse circulation drilling rig with air‑lift reverse circulation for subway construction in Xiamen and Shenzhen with significant construction efficiency,achieving good economic and social benefits.The successful development of the new type square chisel provides a better trenching tool for the construction of underground diaphragm walls.