Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for improving bearing capacity of existing pile foundation
The invention discloses a method for improving the bearing capacity of an existing pile foundation, which comprises the following steps of: drilling a hole in the existing pile foundation, forming a grouting hole, cleaning the hole after the hole is drilled to a designed depth, pumping a casing material to the bottom of the grouting hole through a drill rod after the hole cleaning is completed, then putting a sleeve valve pipe into the grouting hole, connecting a grouting pressure pipe and a grouting inner pipe, and sealing the grouting pressure pipe and the grouting inner pipe. The grouting inner pipe is placed in the sleeve valve pipe, grouting work is carried out in the grouting inner pipe through the grouting pressure pipe, grouting is carried out through a segmented retreating method, in the grouting process, after grouting of each segment is completed, the grouting inner pipe is moved upwards by the length of one step pitch, and open-loop grouting is carried out step by step till grouting of all hole segments is completed. According to the method, by changing the geological friction angle and cohesive force around the pile, the side friction resistance around the pile is improved, the vertical bearing capacity of the pile foundation is greatly improved, meanwhile, the construction quality can be guaranteed, the reinforcing effect is improved, and the construction cost is effectively reduced.
本发明公开了一种既有桩基承载力提升方法，包括在既有桩基进行钻孔，形成注浆孔，钻孔至设计深度后进行清孔，清孔完成后，将套壳料通过钻杆泵送至注浆孔孔底，然后将袖阀管下入注浆孔中，连接注浆压力管和注浆内管，将注浆内管放入袖阀管内，通过注浆压力管向注浆内管内进行注浆工作，采用分段后退法进行注浆，注浆过程中，每段注浆完成后，向上移动一个步距的注浆内管长度，逐步开环注浆，直到完成所有孔段注浆。该方法通过改变桩周地质的摩擦角和黏聚力，进而提升桩周的侧摩阻力，使桩基的竖向承载力大幅提高，同时还能保证施工质量，提升加固效果，并有效降低施工成本。
Method for improving bearing capacity of existing pile foundation
The invention discloses a method for improving the bearing capacity of an existing pile foundation, which comprises the following steps of: drilling a hole in the existing pile foundation, forming a grouting hole, cleaning the hole after the hole is drilled to a designed depth, pumping a casing material to the bottom of the grouting hole through a drill rod after the hole cleaning is completed, then putting a sleeve valve pipe into the grouting hole, connecting a grouting pressure pipe and a grouting inner pipe, and sealing the grouting pressure pipe and the grouting inner pipe. The grouting inner pipe is placed in the sleeve valve pipe, grouting work is carried out in the grouting inner pipe through the grouting pressure pipe, grouting is carried out through a segmented retreating method, in the grouting process, after grouting of each segment is completed, the grouting inner pipe is moved upwards by the length of one step pitch, and open-loop grouting is carried out step by step till grouting of all hole segments is completed. According to the method, by changing the geological friction angle and cohesive force around the pile, the side friction resistance around the pile is improved, the vertical bearing capacity of the pile foundation is greatly improved, meanwhile, the construction quality can be guaranteed, the reinforcing effect is improved, and the construction cost is effectively reduced.
本发明公开了一种既有桩基承载力提升方法，包括在既有桩基进行钻孔，形成注浆孔，钻孔至设计深度后进行清孔，清孔完成后，将套壳料通过钻杆泵送至注浆孔孔底，然后将袖阀管下入注浆孔中，连接注浆压力管和注浆内管，将注浆内管放入袖阀管内，通过注浆压力管向注浆内管内进行注浆工作，采用分段后退法进行注浆，注浆过程中，每段注浆完成后，向上移动一个步距的注浆内管长度，逐步开环注浆，直到完成所有孔段注浆。该方法通过改变桩周地质的摩擦角和黏聚力，进而提升桩周的侧摩阻力，使桩基的竖向承载力大幅提高，同时还能保证施工质量，提升加固效果，并有效降低施工成本。
Method for improving bearing capacity of existing pile foundation
一种既有桩基承载力提升方法
WANG XIGANG (Autor:in) / LI SHAOCHENG (Autor:in) / LYU HUIJIE (Autor:in) / WANG DONGMING (Autor:in) / LI WEI (Autor:in) / ZHANG YONGJIANG (Autor:in) / LU YANNING (Autor:in) / SHANG DAPENG (Autor:in) / TAN CHANGXI (Autor:in) / ZHANG JINWANG (Autor:in)
22.11.2022
Patent
Elektronische Ressource
Chinesisch
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