Construction methods and structures of building pile foundations for earthquake resistance and deflection resistance on weak soil foundations in coastal areas

Abstract

The invention discloses an anti-seismic and inclination prevention construction method of a building pile foundation of a soft soil foundation of a coastal area. The anti-seismic and inclination prevention construction method comprises the following steps of step 1, enabling the high-plasticity flow soil which is located on the upper portion of a soft soil layer to be solidified into a water and soil solidification layer below the bottom elevation of every bearing platform and piling pipe piles and step 2, arranging the plurality of water and soil solidification layers below the plurality of bearing platforms respectively and forming a composite foundation by the water and soil solidification layers and the plurality of pipe piles together, wherein the pipe piles are arranged below every bearing platform. The invention also discloses an anti-seismic and inclination prevention structure of the building pile foundation. According to the anti-seismic and inclination prevention construction method of the building pile foundation of the soft soil foundation of the coastal area, the constraint of the water and soil solidification layers on the positive friction force and the horizontal force is obtained by the pipe piles in the piling process due to the water and soil solidification layers so as to prevent the pipe piles from being inclined in the process of piling or pile foundation bearing platform soil excavation and the composite foundation is high in horizontal thrust resistance and accordingly the stress working conditions of a single pile foundation are changed, a forming natural foundation is combined into an integral stress system, the stiffness is large, the effective pile length of the pipe piles is shortened, the seismic resistance of the pile foundation is improved, and the bearing capacity is large.

Description

Technical field [0001] The invention relates to the technical field of seismic resistance of building pile foundations, in particular to a method and structure for seismic and anti-rotation construction of building pile foundations on soft ground in coastal areas. Background technique [0002] The rapid growth of China's economy promotes the rise and development of high-rise buildings and large-scale industrial buildings, while at the same time the requirements for the bearing capacity and deformation resistance of foundations are getting higher and higher. However, damage to and collapse of buildings caused by natural disasters or man-made disasters often caused casualties: the devastating earthquake occurred in Sichuan Province in May 2008, which was the most destructive earthquake since the founding of the People’s Republic of China and destroyed millions. People’s happiness; in June 2009, the “fragile building” accident occurred in Shanghai, and the “Lianhua Riverside Jingyua...

AI Technical Summary

Problems solved by technology

Among them, for flexible foundations, the foundation may lose its bearing capacity, causing the building to tilt and collapse

In addition, for the case where the rigid foundation of tubular piles may lose the positive friction force of the pile body, the original design of the pile type in which the end-bearing piles and friction piles work together becomes the one where only the end-bearing piles bear the force after losing the frictional resistance of the pile body. Working conditions, this is very likely to cause insufficient compressive strength of the pile end face, and combined failure caused by insufficient bending strength of the pile body

[0005] It is also found from the above-mentioned "fragile building" major liability accident that although the construction of the building meets the requirements of the construction code, the building is still so "fragile and collapsed", which shows that the code is weak for weak foundations and pipe piles for seismic fortification. Hysteresis

[0006] In addition, in the construction of prefabricated pipe piles in thick silt geology, it is difficult to control the flow of mud in the silt layer. It often happens that a pile is driven, and the heavy hammer is driven down, and the whole pile slides down until the soil layer disappears. This is an abnormal construction situation. It is the characteristic that the pile body loses frictional resistance

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