An expansion-resistant uplift anchor pile suitable for soft soil and loose rock and soil

Abstract

The invention relates to an expansion anti-uplift anchor pile suitable for soft soil and loose rock and soil, which solves the problem of the foundation pit enclosure and slope support under the geological conditions of soft soil and loose rock and soil by the existing anti-uplift rod pile. , The effect of tunnel reinforcement is not obvious. The center of the bottom end of the anchor rod of this device is a grouting pipe, and the outer casing of the grouting pipe is provided with a cylindrical geotechnical bag. The upper or lower end of the stranded wire is fixed with the anchor rod, and the other end is a free end. The grouting hole is opened on the pipe wall of the grouting pipe along the helical line surrounding the pipe wall. The outer side of the geotechnical bag is helically bound with a spiral steel strand. The spiral steel strand has the same spiral direction and the same pitch as the spirally opened grouting hole, and the positions of the spiral wires are misaligned. The invention forms a helical segment type with alternating expansion degrees in the layer, and cooperates with a wave-shaped axial steel strand to provide a more reliable pull-out resistance effect.

Description

technical field [0001] The invention belongs to the field of construction engineering, and relates to an uplift-resistant anchor cable structure, in particular to an expansion-resistant uplift anchor pile suitable for soft soil and loose rock and soil. Background technique [0002] Anchor is a rod system structure for rock and soil reinforcement. Through the longitudinal tension of the anchor rod body, it overcomes the shortcoming that the tensile capacity of rock and soil is far lower than the compressive capacity, and increases the cohesion of rock and soil. From a mechanical point of view, it mainly improves the cohesion C and internal friction angle φ of the surrounding rock mass. As a tensile member that goes deep into the ground, the bolt is connected to the engineering structure at one end, and the other end goes deep into the ground. The whole bolt is divided into a free section and an anchor section. area, whose function is to apply prestress to the anchor. In eng...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that under the poor geological conditions of the existing anti-pull pole piles, such as soft soil and loose rock and soil, the anti-pull capacity of the traditional bolt support is greatly affected by the geological conditions and can no longer meet the requirements. In order to solve the problem that the effects of foundation pit enclosure, slope support and tunnel reinforcement are not obvious, an expansion-resistant uplift anchor pile suitable for soft soil and loose rock and soil is provided to improve the resistance of the entire uplift-resistant pole pile. Pulling ability, better support and reinforcement effect

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