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Construction method for reverse circulation drilling grouting expanded-head anchor rod
The invention discloses a construction method for a reverse circulation drilling grouting expanded-head anchor rod. A pre-arrangement method of a reverse circulation drilling grouting expanded-head anchor rod body assembly comprises the following steps of embedding a protective cylinder, preparing slurry, arranging a drilling machine in place, drilling reverse circulation drilling and drilling an expanded head at the bottom end, cleaning a hole by a slurry changing method, detecting, hoisting the anchor rod body assembly, opening and expanding an expansion mechanism to unfold an anchor head, hoisting a guide pipe and grouting concrete. The mud specific gravity index is determined according to geological conditions and is controlled to be 1.2-1.4; during hole opening, the drilling machine slightly presses and slowly rotates, the pressure and the speed are properly increased along with the increase of the depth, thick slurry is adopted for protecting a wall in a soil loose layer, the drilling speed and the rotating speed are slowed down, and hole collapse is controlled through slight drilling and slow advancing; and after a guided part or a drill bit completely enters a stratum, the drilling can be accelerated.
反循环钻孔灌注扩大头锚杆施工工法，反循环钻孔灌注扩大头锚杆杆体总成先置法步骤如下：埋设护筒→制备泥浆→钻机就位→反循环钻孔钻进、底端进行扩大头钻孔→换浆法清孔→检测→吊装锚杆杆体总成→打开、撑开扩大机构展开锚头→吊装导管→灌注混凝土。泥浆比重指标根据地质情况而定，控制在1.2～1.4。开孔时钻机轻压慢转，随着深度增加而适当增加压力和速度，在土质松散层时采用比较浓的泥浆护壁，且放慢钻进速度和转速，轻钻慢进以控制塌孔；待导向部位或钻头全部进入地层后，方可加速钻进。
Construction method for reverse circulation drilling grouting expanded-head anchor rod
The invention discloses a construction method for a reverse circulation drilling grouting expanded-head anchor rod. A pre-arrangement method of a reverse circulation drilling grouting expanded-head anchor rod body assembly comprises the following steps of embedding a protective cylinder, preparing slurry, arranging a drilling machine in place, drilling reverse circulation drilling and drilling an expanded head at the bottom end, cleaning a hole by a slurry changing method, detecting, hoisting the anchor rod body assembly, opening and expanding an expansion mechanism to unfold an anchor head, hoisting a guide pipe and grouting concrete. The mud specific gravity index is determined according to geological conditions and is controlled to be 1.2-1.4; during hole opening, the drilling machine slightly presses and slowly rotates, the pressure and the speed are properly increased along with the increase of the depth, thick slurry is adopted for protecting a wall in a soil loose layer, the drilling speed and the rotating speed are slowed down, and hole collapse is controlled through slight drilling and slow advancing; and after a guided part or a drill bit completely enters a stratum, the drilling can be accelerated.
反循环钻孔灌注扩大头锚杆施工工法，反循环钻孔灌注扩大头锚杆杆体总成先置法步骤如下：埋设护筒→制备泥浆→钻机就位→反循环钻孔钻进、底端进行扩大头钻孔→换浆法清孔→检测→吊装锚杆杆体总成→打开、撑开扩大机构展开锚头→吊装导管→灌注混凝土。泥浆比重指标根据地质情况而定，控制在1.2～1.4。开孔时钻机轻压慢转，随着深度增加而适当增加压力和速度，在土质松散层时采用比较浓的泥浆护壁，且放慢钻进速度和转速，轻钻慢进以控制塌孔；待导向部位或钻头全部进入地层后，方可加速钻进。
Construction method for reverse circulation drilling grouting expanded-head anchor rod
反循环钻孔灌注扩大头锚杆施工工法
WU DONGDONG (author) / WU HAILONG (author)
2021-07-23
Patent
Electronic Resource
Chinese
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