Equipment and method for improving bearing capacity of cast-in-place pile under soft soil foundation condition

Abstract

The invention belongs to the field of foundation engineering and relates to equipment and method for improving a bearing capacity of a cast-in-place pile under a soft soil foundation condition. The equipment comprises a cement paste pumping device, an injection grouting pipe position control device, am injection grouting pipe and a rotatable three-directional nozzle, wherein the injection grouting pipe is arranged on the injection grouting pipe position control device and the position of the injection grouting pipe in a pile hole of the cast-in-place pile through the injection grouting pipe position control device; the cement paste pumping device is connected with the rotatable three-directional nozzle through the injection grouting pipe; the rotatable three-directional nozzle is used for carrying out slurry spraying work on an injection grouting reinforcing region in the pile hole of the cast-in-place pile. The equipment and method for improving the bearing capacity of the cast-in-place pile under the soft soil foundation condition, provided by the invention, are simple in structure and are convenient to control and implement; soft soil at the periphery of a pile body is reinforced by adopting an injection grouting manner and the strength of a soil body is improved, so that the aims of guaranteeing the pile forming quality of the cast-in-place pile under the soft soil foundation condition and improving the friction resistance of a pile foundation side and a total bearing capability are realized.

Description

technical field [0001] The invention belongs to the field of foundation engineering, and relates to a device and a method capable of increasing the bearing capacity of cast-in-place piles, in particular to a device and a method for improving the bearing capacity of cast-in-place piles under soft soil foundation conditions. Background technique [0002] The cast-in-situ pile is a kind of pile formed by directly forming a hole on the site pile position, and then pouring concrete in the hole or placing a reinforcement cage and then pouring concrete. Due to the advantages of no vibration, no soil extrusion, low noise, and large forming diameter during construction, cast-in-situ piles are widely used in the field of foundation engineering in construction, transportation and other industries. However, the construction quality of cast-in-situ piles has a direct impact on the bearing capacity of pile foundations, especially in soft soil foundation engineering conditions, where const...

AI Technical Summary

Problems solved by technology

However, the construction quality of cast-in-situ piles has a direct impact on the bearing capacity of pile foundations, especially in soft soil foundation engineering conditions, where construction is difficult, and quality problems such as diameter shrinkage, collapsed holes, and broken piles often occur. The side frictional resistance of the pile body is low, and it is difficult to exert the side friction resistance of the pile body. However, with the consolidation and settlement of the soft soil foundation during the construction process, a certain negative friction resistance will be generated on the pile body, which significantly reduces the bearing capacity of the cast-in-place pile.

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