Coral sand foundation pile using expansion agent and construction method

Abstract

The invention provides a novel coral sand foundation pile using an expansion agent and a construction method. Carrier piles are uniformly buried inside the coral sand foundation, and the pile bottom of the carrier pile is provided with a lower compacted filling material area; the lower part The expansion agent is filled inside the tamping filler area to form a bottom expansion head structure; the outer wall of the carrier pile is provided with a plurality of side wall extension expansion head branches, and the interior of the side wall extension expansion head branches is filled with expansion agent and Magnetic mortar, and an electromagnet device for controlling the fluidity of the magnetic mortar is arranged inside the branch of the side wall extension expansion head. In this method, expansion agent is added to the expansion area at the bottom of the carrier pile and the branch area of ​​the extension head of the side wall to make it expand, extrude the coral sand around the pile, increase the density of the coral sand, reduce the pore water pressure of the coral sand, and the coral sand particles The effective pressure will increase.

Description

technical field [0001] The invention relates to a coral sand foundation pile using an expansion agent and a construction method, which is particularly suitable for the pile foundation construction of a coral sand foundation with a macropore structure, and belongs to the technical field of pile foundation construction. Background technique [0002] Sand liquefaction refers to loose saturated sand below the water table, which tends to become tighter when subjected to vibration. However, the pores of the saturated sand are all filled with water. Therefore, this tightness will lead to a sudden increase in the pore water pressure, and in the short period of the earthquake process, the suddenly increased pore water pressure has no time to dissipate, which makes the original The pressure (effective pressure) transmitted by the sand particles through their contact points is reduced. When the effective pressure disappears completely, the sand layer will completely lose its shear stre...

AI Technical Summary

Problems solved by technology

[0006] The present invention is aimed at the self-proposed and applied in engineering to guide the construction of body pile pile foundation under the condition of coral sand foundation, and prevents the phenomenon of sand liquefaction in the coral sand foundation. In order to solve the problems of qualified and other problems, a coral sand foundation pile and construction method using expansion agent were independently designed. Coral sand, increase the density of coral sand, make it difficult for the water in the coral sand foundation to enter the coral sand around the pile, reduce the pore water pressure of the coral sand, and the effective pressure between the coral sand particles will increase, thus effectively preventing the sand in the coral sand foundation Liquefaction of the body, improving the stability of the pile, has a wide range of engineering practice significance and application prospects

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