Construction method of bored and bottom-compact cement grouting pile

Abstract

The invention provides a construction method of a bored and bottom-compacted cement grouting pile, relates to a pile foundation construction method, and aims at solving the problems that the end of anexisting underwater cast-in-place pile is subjected to loosened soil, and each bearing stratum cannot be grouted based on the expected standard, and thus the bearing capacity of a cast-in-place pilecannot reach the construction standard. The method comprises the steps of 1, boring; 2, pouring cement paste through the bottom part of a spiral drilling machine to protect the wall and form a pore; controlling the cement paste grouting pressure to be 1-5mp and controlling the water-cement ratio of the cement paste to be 0.6-0.8; 3, ensuring that the lifting speed of a drill bit of the spiral drilling machine is less than the grouting speed until the whole drill bit of the spiral drilling machine is completely lifted from the pore, and thus finishing first grouting; 6, inserting a precast high-strength concrete component into a bore; and compacting the loosened soil at the bottom of the pore through the precast high-strength concrete component in a high-frequency vibrating impacting manner; and 5, performing the second grouting, namely, inserting a pipe in a clearance between the pore and the precast high-strength concrete part; and filling the cement paste into the whole clearance between the pore and the precast high-strength concrete component. The method is applicable to pile foundation construction.

Description

technical field [0001] The invention relates to a construction method of a bored bottom rammed grouting pile. Background technique [0002] With the rapid development of my country's construction industry, the requirements for the bearing capacity of building foundations are getting higher and higher, the foundation forms are also various, and concrete pouring piles are widely used. [0003] At present, in the construction of underwater cast-in-situ pile foundation, due to the specific structure of the head of the drill rig's auger, a part of virtual soil will remain at the bottom of the long auger hole, resulting in a great loss of pile tip resistance. The existing post-grouting construction method cannot guarantee that the grouting of each bearing layer can reach the expected standard, resulting in the bearing capacity of the cast-in-situ pile not reaching the expected construction standard. Contents of the invention [0004] The present invention aims to solve the prob...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that existing underwater pouring piles with virtual soil at the pile ends and post-grouting piles cannot guarantee that the grouting of each bearing layer reaches the expected standard, resulting in the bearing capacity of the pouring piles not reaching the construction standard, and further provides a Construction Method of Drilled Bottom Grouting Pile