松散地層地下結構抗浮錨桿雙鉆頭頂驅鉆進成孔施工技術
                                  • 作者: 鮑萬偉,雷斌,申小平
                                  論文摘要

                                  松散地層地下結構抗浮錨桿雙鉆頭頂驅鉆進成孔施工技術

                                  鮑萬偉,雷斌,申小平

                                  (深圳市工勘巖土集團有限公司,廣東 深圳 518063)

                                  [摘要] 當錨桿成孔遇填土、淤泥質土、粉土等松散易塌地層時,由于抗浮錨桿成孔通常多采用潛孔錘鉆機鉆進,孔底巖層受沖擊成粉狀后與水經高風壓空氣混合成漿液向孔外噴出,對孔壁產生較大的沖刷,容易造成孔壁坍塌,導致錨桿成孔困難。由此提出松散地層地下結構抗浮錨桿雙鉆頭頂驅鉆進成孔施工技術,對其原理、工藝流程、操作要點、實施效果進行了系統闡述。實踐表明,本項技術在工程應用中取得了顯著成效,具有工效高、質量可靠、機械簡單等優點。

                                  [關鍵詞]地下工程;松散地層;抗浮錨桿;雙鉆頭頂驅;施工技術

                                  [中圖分類號]TU753  [文獻標識碼]A          [文章編號]1002-8498(2021)07-0040-04

                                  Double Bit Top Driving Drilling and Hole Forming Construction Technology of Anti Floating Anchor in Loose Stratum

                                  BAO Wanwei, LEI Bin, SHEN Xiaoping

                                  (Shenzhen Gongkan Geotechnical Group Co., Ltd., Shenzhen, Guangdong 518063, China)

                                  Abstract: When forming the hole for anchors in loose and collapsible stratum such as fill, mucky soil and silt, the DTH hammer drilling machine is usually used for the hole forming of anti floating anchor. After the rock layer at the bottom of the hole is impacted into powder shape, it is mixed with water and air under high wind pressure to form slurry and ejected out of the hole. It is easy to collapse the wall of the hole and make it difficult to form the bolt hole because of the large wind pressure. Therefore, this paper suggests the drilling and hole forming construction technology of anti floating anchor with head driving double bit in loose stratum. The principle, process, key points of operation and the effect of implementation are described systematically. The practice shows that the technology has achieved remarkable results in engineering application, with the advantages of high efficiency, reliable quality and simple machinery.

                                  Keywords:underground; loose stratum; anti floating anchor; double bit top driving system; construction

                                  [作者簡介] 鮑萬偉,工程師,國家一級注冊建造師,E-mail317793340@qq.com 

                                   

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