Method for supporting existing building underground added storey through original pile foundations

Abstract

The invention discloses a method for supporting an existing building underground added storey through original pile foundations. The method comprises the steps that the pile foundations of the existing building underground added storey are end bearing piles; before soil around piles are excavated, foundation pit supporting and protection and underground water level reduction preparation work are carried out; the soil around the piles below an existing building is excavated; when the stability of the pile can not satisfy safety requirements, supports are installed between adjacent piles; a plurality of supports are arranged, and the soil around the piles is excavated until a designed elevation is reached; a newly added bottom plate of a basement is poured, and serves as a bearing platform of the pile foundations below the building; a support on the bottom storey is dismantled, and reinforcing steel bars are assembled around the piles from bottom to top; the piles are reinforced and reconstructed to form posts of the basement, and beams and plates of the basement are constructed at the same time; supports in all storeys are dismantled continuously, posts, beams and plates in the upper storey are constructed until the ground; soil is backfilled to the outer side of the basement. According to the method for supporting the existing building underground added storey through the original pile foundations, the existing building is provided with friction piles, new pile foundations are additionally arranged through press piles or bored piles arranged between the original pile foundations, the bearing platform is connected with the original piles through the bearing platform, and a new basement is additionally arranged according to an end bearing pile method.

Description

Technical field [0001] The invention relates to a civil engineering technology, in particular to a method for using original pile foundations to support an underground increase in an existing building. Background technique [0002] The orderly, reasonable, comprehensive and efficient development and utilization of underground space resources of existing buildings has become one of the most effective ways to expand the capacity of infrastructure, improve the city's comprehensive disaster prevention capabilities, improve land use efficiency and save land resources. According to the requirements of urban planning, new buildings have mostly considered the development and utilization of underground space. However, a large number of existing buildings have not designed underground parking lots due to historical reasons and lack of foresight. As the number of cars increases, parking has become difficult. Therefore, the development of the underground space of existing buildings is an ar...

AI Technical Summary

Problems solved by technology

Therefore, for existing buildings with pile foundations, it is undoubtedly wasteful not to fully consider the role of the original pile foundation when considering the plan to support the superstructure

[0005] The Chinese patent application "Process of adding multi-storey basements to existing buildings supported by profiled steel plus horizontal tie rods" (201210407508.4) proposed the idea of ​​using profiled steel to support the basement of existing buildings, but the profiled steel is added later rather than using the original building. Pile foundation

In addition, the connection method between the section steel and the horizontal tie rod is not suitable for the connection between the concrete pile and the steel support, and a new connection method needs to be developed

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