Grouting structure and grouting method for enhancing pulling resistance of pile foundation after self-balance detection

Abstract

The invention discloses a grouting structure and grouting method for enhancing pulling resistance of a pile foundation after self-balance detection. The structure comprises an upper steel reinforcement cage and a lower steel reinforcement cage, and further comprises a loading and guide device. A loading cavity and a guide cavity are formed in the loading and guide device and are connected with a loading cavity grouting pipe and a guide cavity grouting pipe correspondingly. An outer cavity formed among the outer portion of the loading and guide device, the upper steel reinforcement cage and thelower steel reinforcement cage is connected with an outer grouting pipe. The grouting method comprises the steps that a, the loading and guide device with the loading cavity and the guide cavity is buried in the pile foundation; b, grout is injected into the loading cavity through the loading cavity grouting pipe, and self-balance detection of the pile foundation is carried out; c, after detection is completed, grout is injected into space formed between the upper steel reinforcement cage, the lower steel reinforcement cage and the loading and guide device through the outer grouting pipe; andd, grout is injected into the guide cavity through the guide cavity grouting pipe. According to the grouting structure and grouting method, the uplift bearing capacity and the overall structural strength of detected piles are obviously improved.

Description

technical field [0001] The invention relates to a grouting structure and a grouting method for enhancing the pullout resistance of a pile foundation after self-balancing detection. Background technique [0002] At present, with the application and popularization of self-balancing pile foundation static load detection technology, its convenience and economy are becoming more and more prominent. At the same time, new application requirements have emerged, which require related technologies to solve them. In the related technology, the pile body of the engineering pile after the balanced static load test is broken. To solve the problem of restoring the strength of the pile body after the test, it is mainly to increase the external grouting of the load box and the grouting of the load box loading cavity, and the compressive strength after the grout is solidified Higher, improving its resistance to stress. However, under this structure, there is still a cavity between the first...

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Problems solved by technology

However, under this structure, there is still a cavity between the first piston rod and the first cylinder that limit the relative stable movement of the upper pile body and the lower pile body, that is, the first piston rod and the first cylinder still have a relative The moving space leads to its low tensile strength, which cannot produce sufficient tensile force on the tested engineering pile, resulting in low overall structural strength of the engineering pile

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