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Deep foundation pit supporting anchor rod construction method under complex geological conditions
The invention provides a deep foundation pit supporting anchor rod construction method under complex geological conditions. The deep foundation pit supporting anchor rod construction method comprisesthe three steps of drilling, anchor rod body manufacturing and grouting. In order to solve the problems of large water inflow and difficult grouting, after drilling is completed, cement paste is poured, and after the cement paste returns out of a hole opening, the hole opening of a drilled hole and the end of a drill rod are sealed by installing a grout stopping plug and an anchor rod end pluggingdevice. In order to solve the problems that a silt layer and a sand layer are loose and a hole is extremely prone to collapsing in the drilling process, the slurry retaining wall hole forming technology is used for reference, the method of drilling and grouting at the same time is adopted, cement slurry is adopted in the drilling process to replace water for circulation, and the cement slurry pouring amount in the area with serious hole collapse is increased to the maximum extent. Aiming at the problem of drill bit optimization, an originally designed cross arrow-shaped hard alloy drill bit is innovated and improved into a straight hard alloy drill bit with a U-shaped opening, the area of a grouting opening is increased, the soil squeezing effect of a small hole opening is eliminated, andthe problem that a grouting channel of the self-propelled hollow anchor rod in an ultra-thick sludge area is prone to being blocked is solved.
本发明提供一种复杂地质条件下深基坑支护锚杆施工方法，包括钻孔→锚杆杆体的制作→注浆三步骤。针对涌水量大，注浆困难的问题，在钻孔完成后，灌注水泥浆，待水泥浆自孔口返出后，采用安装止浆塞及锚杆端头封堵器将钻孔孔口和钻杆端部进行密封。针对淤泥层、砂层松散，钻进过程中极易塌孔的问题，借鉴泥浆护壁成孔技术，采用边钻孔边注浆的方法，在钻孔过程中即采用水泥浆代替水进行循环，最大限度的提高塌孔严重区域的水泥浆灌注量。针对钻头优化的问题：由原本设计的十字交叉箭形硬质合金钻头，创新改进成带U型口的一字型硬质合金钻头，增大了注浆口面积，排除了小孔口挤土效应，解决了在超厚淤泥区自进式中空锚杆注浆通道易被堵孔的难题。
Deep foundation pit supporting anchor rod construction method under complex geological conditions
The invention provides a deep foundation pit supporting anchor rod construction method under complex geological conditions. The deep foundation pit supporting anchor rod construction method comprisesthe three steps of drilling, anchor rod body manufacturing and grouting. In order to solve the problems of large water inflow and difficult grouting, after drilling is completed, cement paste is poured, and after the cement paste returns out of a hole opening, the hole opening of a drilled hole and the end of a drill rod are sealed by installing a grout stopping plug and an anchor rod end pluggingdevice. In order to solve the problems that a silt layer and a sand layer are loose and a hole is extremely prone to collapsing in the drilling process, the slurry retaining wall hole forming technology is used for reference, the method of drilling and grouting at the same time is adopted, cement slurry is adopted in the drilling process to replace water for circulation, and the cement slurry pouring amount in the area with serious hole collapse is increased to the maximum extent. Aiming at the problem of drill bit optimization, an originally designed cross arrow-shaped hard alloy drill bit is innovated and improved into a straight hard alloy drill bit with a U-shaped opening, the area of a grouting opening is increased, the soil squeezing effect of a small hole opening is eliminated, andthe problem that a grouting channel of the self-propelled hollow anchor rod in an ultra-thick sludge area is prone to being blocked is solved.
本发明提供一种复杂地质条件下深基坑支护锚杆施工方法，包括钻孔→锚杆杆体的制作→注浆三步骤。针对涌水量大，注浆困难的问题，在钻孔完成后，灌注水泥浆，待水泥浆自孔口返出后，采用安装止浆塞及锚杆端头封堵器将钻孔孔口和钻杆端部进行密封。针对淤泥层、砂层松散，钻进过程中极易塌孔的问题，借鉴泥浆护壁成孔技术，采用边钻孔边注浆的方法，在钻孔过程中即采用水泥浆代替水进行循环，最大限度的提高塌孔严重区域的水泥浆灌注量。针对钻头优化的问题：由原本设计的十字交叉箭形硬质合金钻头，创新改进成带U型口的一字型硬质合金钻头，增大了注浆口面积，排除了小孔口挤土效应，解决了在超厚淤泥区自进式中空锚杆注浆通道易被堵孔的难题。
Deep foundation pit supporting anchor rod construction method under complex geological conditions
复杂地质条件下深基坑支护锚杆施工方法
ZHU BAOJUN (author) / MA HAILONG (author) / BAO XIJI (author) / CHEN GUOGUANG (author) / YUE ZHAO (author) / LIU DEZHONG (author)
2020-10-30
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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