Method for performing foundation treatment by using permeable concrete pipe piles

Abstract

The invention discloses a method for performing foundation treatment by using permeable concrete pipe piles, which comprises the following steps of: selecting a soft soil foundation or a liquefiable foundation for the arrangement of the permeable concrete pipe piles, wherein the permeable concrete pipe pile is a closed pipe pile of which two ends are closed and a pile body is made of permeable concrete; and arranging the piles along narrow sides in a site, connecting the centers of each row of permeable concrete pipe piles into a straight line and paving a cushion along the straight line, wherein the cushion is made of sands or gravels; and the cushion has a width equal to the diameter of the pipe pile and is 20 to 40cm thick. The permeable concrete pipe piles not only function as reinforcement bodies of composite foundations, but also are good drainage channels per se. As the advantages of the composite foundations treated by a drainage consolidation method and a composite foundation method are integrated, the method has the advantages of improving foundation treatment effect, shortening a construction period and saving the engineering construction cost.

Description

technical field [0001] The invention relates to a foundation treatment method, which belongs to the technical field of civil engineering. Background technique [0002] In my country's vast territory, there are a large number of bad foundations, such as soft soil foundation and liquefied foundation, etc., so foundation treatment is a problem often encountered in civil engineering. At present, the commonly used soft soil foundation treatment methods can be mainly divided into two categories from the mechanism of action: drainage consolidation method and composite foundation method. The drainage consolidation method is to set drainage channels in the soft soil foundation, such as sand wells, drainage boards, etc., to improve the permeability of the foundation, thereby accelerating the dissipation of the excess static pore water pressure caused by the load in the foundation, and accelerating the consolidation rate of the foundation , to reduce post-construction settlement. The...

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Problems solved by technology

[0003] At present, the commonly used drainage consolidation methods include plastic drainage boards, sand wells and gravel piles. Among them, the plastic drainage boards have a small cross-section and cannot play the role of a composite foundation reinforcement. The strength of sand wells and gravel piles is low, and the composite foundation effect poor

However, most of the reinforcements used in the commonly used composite foundations are weakly permeable materials, such as concrete, cement soil, reinforced concrete, etc., which reduce the drainage channels of the foundation and reduce the overall permeability. Especially the consolidation of the underlying layer is unfavorable, and the post-construction settlement is difficult to control

[0004] For liquefied foundations, sand piles and gravel piles are commonly used to deal with them. However, due to the low strength of sand piles and gravel piles, the strength and bearing capacity of the foundation treated by these two methods are not high, and the settlement is large.

General semi-rigid piles (such as cement-soil mixing piles) and rigid pile composite foundations have high bearing capacity, but due to the low permeability of composite foundations and the lack of drainage channels, it is difficult to quickly discharge ultra-static pore water generated during earthquakes, so the ability to resist liquefaction lower

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