Reaming and grouting spiral pile, pile foundation and pile construction method

Abstract

The invention discloses a reaming and grouting spiral pile, a pile foundation and a pile construction method. The reaming and grouting spiral pile comprises a pile rod and a reaming device, wherein atleast one spiral blade is arranged at the peripheral side of the pile rod in a length direction; the reaming device is arranged on the pile rod and is positioned at the part, between the end part used for being connected with a power head and any one spiral blade, of the pile rod, so that a soil body is extruded in the soil layer in a length direction and / or the peripheral side of the pile rod. The reaming and grouting spiral pile provided by the invention can improve the bearing ability of the spiral pile on the premise of not changing specifications by performing reaming and grouting on theupper part of the soil layer through the reaming device.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a pile foundation and accessories suitable for various buildings such as buildings, bridges, and pipelines. Background technique [0002] For example, the patent document with the application number CN201520859004.5 (hereinafter referred to as reference document 1) discloses a spiral steel pile, and the aforementioned spiral steel pile is provided with spiral blades on the outer peripheral side along its axial direction. During the construction, the spiral steel pile is screwed into the soil layer through the power head and other equipment. It does not generate mud, does not discharge soil, and has low noise. Compared with the construction of concrete pouring pile foundation and concrete expansion foundation, it has advantages. [0003] Most of the applications of the above-mentioned and even ordinary spiral steel piles are photovoltaic power stations. As the foundation of the p...

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Problems solved by technology

[0005] Enlarging the diameter of the steel pipe, the diameter of the blade, increasing the axial length of the steel pipe, the thickness of the blade, etc. will increase the contact area between the spiral steel pile and the soil during the screwing process, thereby enhancing the frictional resistance between the spiral steel pile and the soil , which increases the difficulty of construction and requires higher specifications for equipment such as power heads

[0006] (2) Spiral steel piles are used to resist construction loads during construction, such as torque, and the required pile bearing capacity is much higher than that required to resist working loads, such as pressure or pullout force. Therefore, when used as a load-bearing part of a certain foundation after construction, the material strength of the spiral steel pile cannot be fully utilized

[0007] (3) During the screwing process of the spiral steel pile, the upper part of the steel pipe as the pile body is less constrained by the soil, and the pile shaft is prone to shaking, causing the upper part of the pile shaft to squeeze the surrounding soil, making the soil and the pile shaft A gap is formed between the upper parts, which cannot provide effective grip and reduce the bearing capacity of the spiral steel pile

Spiral steel piles do not use concrete pouring and their steel pipes are thinner than other pile types, resulting in soft soils that cannot provide sufficient horizontal bearing capacity

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