Guide pit type manual pot holing pile reinforing and underpinning method for building foundation and composite supporting pile

Abstract

The present invention discloses a method for strengthening and underpinning existent building foundation by adopting pilot tunnel type artificial digging pile. The main principle of said method lies in that it utilizes vertical and horizontal pilot tunnel, adds the measures of lighting, ventilation, supporting and precipitation and constructs artificial digging pile under the building foundation and makes the artificial digging pile and the original building foundation implement effective connection so as to attain the goal of strengthening and underpinning existent building foundation. Said invention also provides the concrete operation steps of said method.

Description

Technical field: [0001] The invention belongs to the technical field of foundation construction of fixed buildings, in particular to the foundation reinforcement, underpinning and rectification technology for existing buildings. Background technique [0002] During the use of some existing buildings, due to uneven foundation soil, inadequate foundation treatment, leakage of pipelines in the foundation or the periphery of buildings, and rising groundwater levels, the bearing capacity of the foundation soil is reduced or water subsidence, underground caverns collapse, and construction Non-uniform changes in the foundation soil of existing buildings or a decrease in overall stability due to uneven loads inside and outside the building or eccentric loads on the foundation, excavation of foundation pits near buildings, defects in foundation design or poor construction quality, etc. , so that uneven settlement or local cracking and deformation of the foundation of the building wil...

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Problems solved by technology

The rotary spraying pile method and the pressure grouting method consume a lot of water, are prone to additional deformation, and cause great environmental pollution, and the quality is difficult to control; if the static pressure pile method encounters broken stones or loess ancient The calcareous nodule layer in the soil is difficult to construct; the lime pile method is generally on the outside of the foundation, and the force is not directly applied. If the water content in the foundation soil is large or the source of water cannot be blocked, it is easy to absorb water and soften into ash paste, and the strength is reduced. no reinforcement effect

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