高风压潜孔锤钻进在阳蟒高速公路 采空区治理中的应用

Application of High Air-pressure DTH Drilling in Mimed-out Area Treatment for Yangcheng-Manghe Expressway

摘要:

阳城—济源高速公路阳城—蟒河段CK3合同段采空区地基不稳定，用全充填压力注浆法治理。由于限制使用泥浆，以及卵砾石层成孔困难等问题，选择采用高风压潜孔锤钻进成孔，取得了良好的效果。本文从注浆孔的设计、施工设备的选择、钻具组合以及钻进工艺、除尘污染控制等总结了高风压潜孔锤钻进技术在采空区注浆钻孔施工的经验，对同类型工程的采空区治理具有参考意义。

Abstract:

For being situated in a mined out area, the foundation was unstable in CK3 contract section of Yangcheng-Manghe section of Yangcheng-Jiyuan expressway, the full filling pressure grouting method was used in the treatment. Because mud was restricted and hole completion was difficult in gravel layer, high pressure DTH hammer was applied with good effect. This paper summarizes the construction experience of grouting boring in mined-out area with high air-pressure DTH drilling technology in grouting hole design, equipments selection, BHA & drilling technology and dust & pollution control, which can be reference to the mined-out area treatment for the similar project.