A method for rectifying deflection correction and strengthening of grouting joint prestressed anchor static pressure pile

Abstract

The invention discloses a grouting combined prestressed anchor rod static pressure pile rectification and reinforcement method. Firstly, the maximum settling position and the inclined direction of a building are determined; grouting holes are excavated; prestressed anchor rod static pressure piles are arranged; prestress devices are mounted on the static pressure piles; the building is connected with the static pressure piles through the prestress devices; then, cement base composite chemical grouting materials are mixed; the grouting materials are filled in a foundation through grouting pipes, and generate the excess pore pressure in the grouting holes to upwards deform soil of the foundation; the building is upwards hoisted under the effect of the excess pore pressure of the soil of the foundation; finally, proper prestress is applied to the static pressure piles, so that the building is suffered from upward support force to stop settling after grouting; and after grouting material induration forms strength, the next grouting operation can be performed. The rectification and reinforcement method has the advantages of simple operation, low risk, safety, reliability and capability of effectively slowing down dissipation of the excess pore pressure.

Description

technical field [0001] The invention relates to the technical field of deviation correction and reinforcement of existing building structures, in particular to a method for correcting deviation and strengthening of building structures by using grouting combined with prestressed anchor static pressure piles. Background technique [0002] With the acceleration of urban construction and development, more and more engineering projects are carried out in urban construction-intensive areas. Carrying out engineering construction projects in densely built urban areas, especially foundation pit engineering, can easily cause impacts such as settlement and inclination on surrounding buildings where the engineering project is located. [0003] Due to the settlement and inclination of surrounding houses and buildings caused by engineering construction, the original buildings must be rectified and reinforced. [0004] Among the traditional construction techniques for building reinforceme...

AI Technical Summary

Problems solved by technology

However, the solidification of grout made of inorganic materials such as cement takes a long time. Once the grouting stops, the building will sink again as the excess pore pressure dissipates.

Therefore, the traditional method of pressure grouting to correct the deviation of buildings has higher requirements on the load of the object to be corrected. It is usually suitable for small buildings and buildings with small loads. Even so, the deviation correction effect is not ideal. few applications

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