Splicing variable-diameter rigid pile casing compaction pile and construction method thereof

Abstract

The compaction pile comprises a pile body and the pile casing arranged outside the pile body in a sleeving mode, the pile casing comprises a bottom cylinder, a middle cylinder and a top cylinder which are coaxially connected in sequence, and bottom cylinder fixing bolts are evenly distributed on the outer wall of the end, close to the middle cylinder, of the bottom cylinder in the annular direction; first middle cylinder fixing bolts are evenly distributed on the outer wall of the end, close to the bottom cylinder, of the middle cylinder in the annular direction, second middle cylinder fixing bolts are evenly distributed on the outer wall of the end, close to the top cylinder, of the middle cylinder in the annular direction, top cylinder fixing bolts are evenly distributed on the outer wall of the end, close to the middle cylinder, of the top cylinder in the annular direction, and the bottom cylinder fixing bolts and the first middle cylinder fixing bolts are connected through first connecting plates. And the middle cylinder second fixing bolt and the top cylinder fixing bolt are connected through a second connecting plate, the bottom cylinder, the middle cylinder and the top cylinder are all composed of a plurality of arc-shaped plates which are spliced with one another, and the purposes of preventing the compaction pile body from being twisted and broken, improving the integrity of the pile body, improving the compaction effect and effectively reducing negative friction can be achieved.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a splicable variable-diameter rigid casing compaction pile and a construction method thereof. Background technique [0002] With the rapid development of my country's social and economic construction, there are more and more high-rise buildings and large municipal structures, the requirements for safety levels are getting higher and higher, and the requirements for the quality of foundation projects are becoming more and more stringent. The advantages of high bearing capacity, strong anti-overturning ability and effective control of foundation settlement have become the main foundation forms. Although the traditional rigid pile foundation has high pile bearing capacity and stiffness, due to the hole-forming construction technology. Limitation, there is no obvious compaction effect on the soil around the pile, and no obvious effect on eliminating the collapsibility of the fou...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of social and economic construction in our country, there are more and more high-rise buildings and large municipal structures, the requirements for safety level are getting higher and higher, and the requirements for the quality of foundation engineering are becoming more and more strict. The advantages of high bearing capacity, strong anti-overturning ability, and effective control of foundation settlement have become the main foundation form. Although the traditional rigid pile foundation has high bearing capacity and stiffness of the pile body, due to the hole-forming construction technology It has no obvious compaction effect on the soil around the pile, and has no obvious effect on eliminating the subsidence of the foundation.

[0003] The compaction pile composite foundation can achieve the compaction effect required by the project, and it is easy to obtain local materials. At present, it has become one of the effective methods to strengthen the collapsible and other weak foundations above the groundwater level. However, engineering practice shows that in collapsible When the compacted pile composite foundation is used in loess, miscellaneous fill, soft soil and various bad soil areas, there are different degrees of uneven settlement of the foundation, insufficient bearing capacity of the pile body, and fracture of the pile body. The reason for this problem is that : 1. Compacted piles are prone to shrinkage or collapse when forming holes; 2. Uneven or incompact compaction of compacted pile fillings is the main cause of pile loosening and fracture. The load on compacted piles Frictional resistance, as well as problems such as necking, collapse, broken piles, and displacement of compacted piles, will lead to insufficient bearing capacity of the composite foundation, yielding or even failure of the composite foundation, and in severe cases will cause inclination, cracking or even failure of the superstructure. Collapse will seriously threaten the safety of people's life and property

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