Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Pile end post-grouting reinforcement structure of overlying gap stratum foundation pile and construction method
The invention provides a pile end post-grouting reinforcement structure of an overlying gap stratum foundation pile and a construction method. The pile end post-grouting reinforcement structure comprises an inflation pipe, a grouting pipe, a lower concrete layer, a medium fine sand filling layer, an upper concrete layer and a steel plate. The method comprises the steps of drilling, lowering a grouting pipe, plugging a rock stratum interface, lowering an inflating pipe, sealing a hole, inflating and grouting, stopping inflating and grouting. The grouting and the air inflation are carried out simultaneously, and the air inflation pressure is higher than the grouting pressure. By means of the method of combining high-pressure inflation of the overlying gap stratum and high-pressure grouting of the underlying bearing stratum, grouting reinforcement can be directionally conducted on the bearing stratum under the action of the pressure field difference. Static load tests are carried out on the pile foundation before and after the pile foundation is reinforced through the method, it is found that after the pile foundation is reinforced through the method, the bearing capacity of a single pile is remarkably improved, the static pressure displacement curve is stable in development, and the bearing capacity characteristic value meeting the design requirement is met. The method is scientific and reasonable, the process is simple, and a good treatment effect is achieved.
本发明提供一种上覆夹隙地层基桩的桩端后注浆加固结构及施工方法，所述结构包括充气管、注浆管、下层混凝土层、中细砂填充层、上层混凝土层和钢板；所述方法包括：钻孔、下放注浆管、封堵岩层界面、下放充气管、封孔、充气压浆、停止充气和压浆；且其中包括同时压浆和充气，且充气压力高于压浆压力。本发明通过对上覆夹隙地层高压充气和下卧持力层高压注浆相结合的方法，在压力场差作用下可以定向地对持力层进行注浆加固。对采用本发明所述方法加固前后的桩基进行静载试验发现，使用本发明的方法加固后单桩承载力显著提高，静压位移曲线发展平稳，满足设计要求的承载力特征值。本发明所述方法科学合理，工序简单，取得了良好的处理效果。
Pile end post-grouting reinforcement structure of overlying gap stratum foundation pile and construction method
The invention provides a pile end post-grouting reinforcement structure of an overlying gap stratum foundation pile and a construction method. The pile end post-grouting reinforcement structure comprises an inflation pipe, a grouting pipe, a lower concrete layer, a medium fine sand filling layer, an upper concrete layer and a steel plate. The method comprises the steps of drilling, lowering a grouting pipe, plugging a rock stratum interface, lowering an inflating pipe, sealing a hole, inflating and grouting, stopping inflating and grouting. The grouting and the air inflation are carried out simultaneously, and the air inflation pressure is higher than the grouting pressure. By means of the method of combining high-pressure inflation of the overlying gap stratum and high-pressure grouting of the underlying bearing stratum, grouting reinforcement can be directionally conducted on the bearing stratum under the action of the pressure field difference. Static load tests are carried out on the pile foundation before and after the pile foundation is reinforced through the method, it is found that after the pile foundation is reinforced through the method, the bearing capacity of a single pile is remarkably improved, the static pressure displacement curve is stable in development, and the bearing capacity characteristic value meeting the design requirement is met. The method is scientific and reasonable, the process is simple, and a good treatment effect is achieved.
本发明提供一种上覆夹隙地层基桩的桩端后注浆加固结构及施工方法，所述结构包括充气管、注浆管、下层混凝土层、中细砂填充层、上层混凝土层和钢板；所述方法包括：钻孔、下放注浆管、封堵岩层界面、下放充气管、封孔、充气压浆、停止充气和压浆；且其中包括同时压浆和充气，且充气压力高于压浆压力。本发明通过对上覆夹隙地层高压充气和下卧持力层高压注浆相结合的方法，在压力场差作用下可以定向地对持力层进行注浆加固。对采用本发明所述方法加固前后的桩基进行静载试验发现，使用本发明的方法加固后单桩承载力显著提高，静压位移曲线发展平稳，满足设计要求的承载力特征值。本发明所述方法科学合理，工序简单，取得了良好的处理效果。
Pile end post-grouting reinforcement structure of overlying gap stratum foundation pile and construction method
一种上覆夹隙地层基桩的桩端后注浆加固结构及施工方法
LIU YUN (Autor:in) / ZHANG JIE (Autor:in) / MA LIANG (Autor:in) / ZHANG FANXIANG (Autor:in) / SUN WEIHONG (Autor:in) / YANG XIN (Autor:in) / MA SHENGGANG (Autor:in) / WANG WEIJIANG (Autor:in)
18.04.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
E02D
FOUNDATIONS
,
Gründungen
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