Umbrella-shaped enlarger for pile foot and pile body

Abstract

An umbrella-shaped expander for the tip end or the body of pile is composed of external sleeve barrel composed of several movable petals at middle segment of barrel wall, umbrella-shaped supporting parts inside the external sleeve barrel and hinged between lower ends of a force-transfer rod and the said movable petal, and a jaw-shaped hook releasing mechanism hinged to upper end of the force-transfer rod. After the pile is driven to the design depth, pulling the hook releasing mechanism can open the expander installed at tip end of pile and concrete is poured. After concrete is forced out to compress the soil, an enlarged pile bottom end is formed.

Description

technical field [0001] The present invention relates to devices having an enlarged head at the bottom of the pile or a centrally enlarged portion of the pile body. Background technique [0002] Vibration-sinking piles, which are widely used at present, usually have a uniform diameter of the pile body and pile end (unless the cross-sectional area is reduced due to the necking of the pile body), and its characteristic is that the bearing capacity of a single pile is relatively small, so generally Generally speaking, for a certain building load, the number of piles to be arranged per unit area is large, which often causes serious soil squeezing effects, which brings many adverse effects. For example, due to the strong soil squeezing effect, the site soil uplifts, a large-scale and high proportion of broken piles, and the damage to existing buildings and underground pipelines around the construction site caused by soil compaction. ...

AI Technical Summary

Problems solved by technology

[0002] Vibration-sinking piles, which are widely used at present, usually have a uniform diameter of the pile body and pile end (unless the cross-sectional area is reduced due to the necking of the pile body), and its characteristic is that the bearing capacity of a single pile is relatively small, so generally For a certain building load, the number of piles to be arranged per unit area is relatively large, which often causes serious soil squeezing effects, which bring many adverse effects

For example, due to the strong effect of soil extrusion, the site soil uplifts, large-scale and high proportion of broken piles, and soil extrusion causes damage to existing buildings and underground pipelines around the construction site, etc.

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