Existing pile foundation strengthening method based on grout control

Abstract

The invention provides an existing pile foundation strengthening method based on grout control and relates to the field of pile foundation construction. Drill holes with a certain number are distributed in the periphery of an existing pile foundation, double pipes are downwards put into the drill holes, and water pipes and grout pipes are arranged in the double pipes. Water injection nozzles and grouting heads are arranged at the bottoms of the double pipes and communicate with corresponding supplying ends through pipelines correspondingly; the water injection nozzles first output high-pressure water flow towards the existing pile foundation to disturb the soil body, and a softened strengthening area is formed; and then the grouting heads conduct low-pressure grouting on the softened area,the grout flowing range is easy to control, the strengthened area is filled and compacted, strengthening is conducted section by section till the ground surface is reached, the above method is repeated to strengthen the drill one by one, and a ring-shaped sealed strengthening ring is formed on a pile body. The problem that the grout is uncontrollable in a traditional grouting method is solved, the effective rate of the grout is improved, the bearing force of the existing pile foundation is improved, pile top settling is reduced, and effective strengthening on the existing pile foundation is easily and conveniently achieved.

Description

technical field [0001] The present disclosure relates to the field of pile foundation construction, in particular to an existing pile foundation reinforcement method based on grout control. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Pile foundation is an important foundation type of various buildings and bridges. Pile foundations are deeply buried in the ground and are prone to various diseases, such as defects in construction quality, corrosion of steel bars, erosion and peeling of concrete, erosion of soil around piles, and pile foundations. Different types of diseases such as large horizontal displacement occurred; a large number of pile foundation projects in service had structural damage and bearing performance damage, which required reinforcement and maintenance. In the renovation and expansion project, the existing pile foun...

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Problems solved by technology

[0004] The inventors found that the common existing pile foundation reinforcement methods mainly include pile supplement method, anchor static pressure pile, tree root pile method and grouting reinforcement method, etc., but the above reinforcement methods mostly focus on post-grouting reinforcement of newly built pile foundations To improve the bearing capacity of pile foundations, there is still a lack of research on the grouting reinforcement of existing pile foundations, and because the flow of grout is related to the permeability, strength, and grouting pressure of rock and soil, it is not easy to control, and the efficiency of grout is low, resulting in Waste, resulting in the quality of grouting cannot be guaranteed; in the process of grouting reinforcement for the existing pile foundation, the grout gradually fills the gap along the soil body, the grouting body can increase the side resistance of the pile, but its reinforcement performance is limited, the grout and the pile body contact The area is limited, it is difficult to effectively improve the bearing characteristics of the pile foundation

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