Grouted steel pipe pile foundation strengthening system and construction method thereof

Abstract

The invention provides a grouted steel pipe pile foundation strengthening system and a construction method thereof. A static pile pressing anchor rod is embedded in a bottom plate of a building structure to fix a pile pressing counter force frame, the self-weight loads capable of being applied by the building structure serves as pile pressing counter force, a jack is used for pressing pile sections of the steel pipe pile into the foundation section by section through a pile pressing hole reserved or chiseled in the bottom plate, construction is convenient, and the operation face and the operation space are small. During pile sealing, after the anchor rod is bent, connection ribs are used for being connected with anchoring ribs on the top of a steel pipe column into a whole. The non-contractible grouting material is used for connecting a pile head with the bottom plate of the building structure together, the purposes of improving the foundation bearing force and controlling sedimentation are achieved, and the enough length is designed according to the specific stress situation. Restraint type grouting is adopted in a lower pile body of the steel pipe pile, an enlarged pile body partis formed, the bond stress of the pile body and the surrounding soil body is enhanced, and therefore after grouting, the single-pile pulling resistance (anti-pressing) bearing force of the steel pipepile is enhanced, and integral stress is formed through the pile head and foundation rigidity connecting combination.

Description

technical field [0001] The invention relates to the technical field of building foundation construction, in particular to a foundation reinforcement system of grouted steel pipe piles and a construction method thereof. Background technique [0002] The basement structure that has been put into use needs foundation reinforcement due to structural design errors caused by insufficient geological survey data, changes in building functions, increase in use load, and defects in pile foundation construction quality. Traditional foundation reinforcement systems have unstable reinforcement effects, The shortcomings of large working surface and working space, slow construction progress and high cost. Contents of the invention [0003] In view of the existing or potential deficiencies in the above-mentioned prior art, the present invention provides a foundation reinforcement system of grouted steel pipe piles and its construction method. Good ground reinforcement effect. [0004] I...

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Problems solved by technology

[0002] The basement structure that has been put into use needs to be reinforced due to structural design errors caused by insufficient geological survey data, changes in building functions, increased use load, and defects in pile foundation construction quality. Traditional foundation reinforcement systems have unstable reinforcement effects, Disadvantages of large working surface and working space, slow construction progress and high cost

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