Novel bottom expanding device and method for bored concrete pile with sharp teeth

Abstract

The invention belongs to the field of foundation engineering, and relates to a novel bottom expanding device and method for a bored concrete pile with sharp teeth. The novel bottom enlarging device for the bored concrete pile with sharp teeth comprises a slurry inlet (1), a slurry outlet (2), an upper slurry baffle plate (3), a lower slurry baffle plate (4), sharp teeth (5), a closed expansion ring (6), a preset grouting pipe (7) and a preset slurry outlet pipe (8), wherein the slurry inlet (1), the slurry outlet (2), the upper slurry baffle plate (3), the lower slurry baffle plate (4) and the closed expansion ring (6) are tightly connected together; the sharp teeth (5) are uniformly distributed below the lower slurry baffle plate (4); and after the closed expansion ring (6) is expanded, the upper slurry baffle plate (3), the lower slurry baffle plate (4) and the closed expansion ring (6) form a disc-shaped head expanding body (14) with sharp teeth. The bottom expanding device disclosed by the invention has the advantages of simplifying the technical links of bottom expansion of pile ends, and fully expanding under the action of high grouting pressure by utilizing the bottom expanding device while casting to form a head expanding base.

Description

technical field [0001] The invention belongs to the field of foundation engineering, and relates to a novel cast-in-place pile bottom expansion device and method with sharp teeth, which can be widely used in the construction of bored cast-in-place piles in various foundations, especially for gravel-containing pebble layers and soft soil foundations, which are superior Sex is more obvious. Background technique [0002] At present, bored piles are used more and more in the foundation construction of high-rise buildings. The advantages of large diameter, simple construction and high bearing capacity make them have a wide application prospect. However, during the construction of conventional bored piles, there are void soil and sediments that are difficult to clean up at the pile ends. Issue) pointed out that too thick pile tip sediment will not only greatly reduce the bearing capacity of the pile tip (the maximum drop in the test in this paper is 50%), but also have a great ...

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Problems solved by technology

[0005] Based on the above problems, the object of the present invention is to provide a new type of cast-in-place pile bottom expansion device and method with tines, which combines the two links of bottom expansion and concrete pouring in the bottom expansion process, which can not only achieve compaction of pile ends. The engineering purpose of improving the bearing capacity of single piles is to improve the bearing capacity of single piles, simplify the process of bottom expansion at pile ends, save grouting materials, and solve the problem of grouting expansion in hard and soft foundations such as gravel and pebble layers. Engineering problems with poor bottom effect

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