Cast-in-situ bored pile and expansion and compaction construction method thereof

Abstract

The invention relates to a cast-in-situ bored pile and a construction method thereof. The construction method comprises the following steps of: A) embedding a pile casing on a construction site; B) drilling a hole; C) cleaning the hole; D) putting a dry powder expansion material into the bottom of the hole, and arranging a reinforcement cage in the hole; and E) concreting, absorbing water to expand the expansion material so as to compact sediment at the bottom of the pile, wherein the expansion material comprises 85 to 90 weight percent of cement and 10 to 15 weight percent of UEA expansive agent. The sediment at the bottom of the pile is compacted by the expansion material under the condition that construction processes are not increased, so that the sediment has the same hardness as a bearing layer at the end of the pile. Compared with the traditional grouting process at the end of the pile, the construction method is simple and applicable; therefore, in the construction method, the number or length of piles can be reduced under the condition that the bearing capacity of the pile is improved.

Description

technical field [0001] The invention belongs to the field of building construction, and in particular relates to a bored cast-in-place pile for compacting the sediment at the bottom of the bored cast-in-place pile by using an expansion material and a construction method thereof. Background technique [0002] Bored piles are widely used in the fields of transportation, water conservancy and construction because of their unique advantages such as high bearing capacity, strong adaptability and low cost. Bored cast-in-situ piles often produce sediment at the bottom of the pile. If the pile bottom sediment is not removed, it will affect the combination of concrete and bedrock, thereby affecting the bearing capacity of the cast-in-situ pile. In the prior art, there are roughly two processing methods for pile bottom sediment: [0003] 1. Hole cleaning method through mud circulation. The main idea of ​​the mud circulation hole cleaning method: After the hole is formed, the bottom ...

AI Technical Summary

Problems solved by technology

The main disadvantage of pile bottom grouting reinforcement method: due to the existence of cracks in the soil layer, the cement slurry pressed by the high-pressure pump tends to spread along these cracks, resulting in a large dispersion of pile foundation bearing capacity

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