Prefabricated piles filled with sand and gravel with external hoops and its construction method

Abstract

The invention discloses a prefabricated pile with external hoops and filled with sand-gravel aggregates, and a construction method thereof. A section-shaped spaced diameter-expanded pile body is formed through connecting the external diameter-expanding hoops of a pile body and pile-bottom-expanding pile tips with the pile body after the prefabricated pile is formed. The sand-gravel aggregates are filled in the periphery of the pile while the prefabricated pile with the external hoops is pressed or punched in foundation soil, and finally a composite foundation in which the prefabricated pile with the external hoops, the sand-gravel fillers in the periphery of the pile, and the foundation soil co-act is formed. In the method, the sand-gravel fillers in the periphery of the pile form a water drainage channel, a soil mass consolidation process is accelerated, and post-construction settlement after construction is completed is controlled; a larger soil mass internal friction angle of the sand-gravel aggregates provides higher pile side friction resistance of a pile foundation, thus the bearing capacity of the pile foundation can be improved; and each external hoop comprises a diameter-expanding hoop of the pile body and a pile-end-expanding pile tip. The equipment is simple, independent die customization is not required, and a fixing position on the pile body is adjustable, thus the prefabricated pile is adaptive to many designs and working conditions, and high in engineering adaptability; and the spaced diameter-expanded pile body is capable of providing bearing capacity higher than the bearing capacity of a prefabricated pile having an outer diameter which is the same as that of a diameter-expanded section, and capable of saving the manufacturing cost, thus achieving good economic benefits.

Description

technical field [0001] The invention belongs to the field of construction methods, and in particular relates to a prefabricated pile filled with sand and gravel with external collars and a construction method thereof. Background technique [0002] As an important link in engineering construction, pile foundation engineering has a decisive impact on the quality and economic benefits of the entire project. In pile foundation engineering, prefabricated piles have the advantages of fast construction speed, high single pile bearing capacity, guaranteed pile quality, and excellent economic benefits, and have been widely used in actual engineering. [0003] However, there are also some problems in the actual construction process of prefabricated piles. For soft soil foundations, especially saturated soft clay foundations, due to the lack of vertical drainage mechanism or the depth of the drainage board installed is far less than the length of the pile, the differential settlement ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of differential settlement of the pile foundation after construction due to the slow consolidation of the foundation soil in the prior art, and to provide a prefabricated pile filled with sand and gravel with an external collar

Images