Pile foundation pouring device and construction method thereof

Abstract

The invention discloses a pile foundation pouring device and a construction method thereof. The device comprises a slurry blocking protective cylinder, wherein the slurry blocking protective cylinder comprises a protective cylinder base body and a plurality of slurry blocking plates, the protective cylinder base body and the slurry blocking plates are connected through connecting pieces, and a cylinder is fixedly arranged on a steel reinforcement cage. The construction method comprises the following steps that S1, the number of caves and the height of each layer of caves are surveyed, and the number and the length of the slurry blocking protective cylinders needing to be installed are determined; S2, the slurry blocking protective cylinder is installed on the steel reinforcement cage; S3, the slurry blocking protective cylinder is placed into a pile hole along with the steel reinforcement cage; and S4, concrete is poured, the slurry blocking plates seal the space between the protective cylinder base body and the pile wall, and the concrete is continuously poured, so that the concrete reaches the design elevation of the pile top. According to the pile foundation pouring device and the construction method thereof, the device realizes low-cost, safe and reliable concrete pouring, and the stress structure of the pile foundation is improved; and by the adoption of the construction method, the defects existing in a backfilling method, a steel protective cylinder follow-up method and a grouting method can be overcome.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction, in particular to a pile foundation pouring device and a construction method thereof. Background technique [0002] my country has a vast territory and diverse geology. It is the country with the largest distribution of karst landforms. It is distributed from tropical to cold temperate zones, from humid areas to arid areas. Karst landforms have a large area, wide distribution, and complete types. The vast southern regions, especially Guangxi, Guizhou and eastern Yunnan are the most typical concentrated areas of karst landform distribution in the world. [0003] Pile foundation is a common foundation project for housing construction, bridges and other projects. Such projects in karst areas often encounter the working condition that the pile foundation needs to pass through the lower karst cave. According to the size and distribution of the karst cave, whether there is filling i...

AI Technical Summary

Problems solved by technology

[0011] Steel casing follow-up method: it is difficult to lower the casing and the cost is high

Generally, after the pile foundation concrete is poured, the casing of the bored pile needs to be pulled out after the initial setting of the concrete and before the final setting of the concrete. The timing of pulling out the casing is difficult to hold, and the adhesion between the casing and the concrete is strong, which is easy to damage the concrete. structure

After the casing is pulled out, there is a gap between the pile foundation concrete and the pile hole, and the lateral restraint force of the pile foundation is small, which is unfavorable to the force of the structure; if the casing is not pulled out, the cost will be high

[0012] Grouting method: When the horizontal space of the karst cave is large, or even connected to the underground underground river, the amount of grouting is large, the cost is huge, and even the grouting fails, the hole formation fails, and the pile foundation concrete cannot be poured

Even if the grouting is successful, the poured pile foundation concrete and the grouting junction are integrated into a whole. When the grouting junction sinks due to the soft sedimentary soil below, part of the gravity of the grouting junction acts on the pile foundation. Changing the stress structure of the pile foundation may have adverse effects on the safety and quality of the pile foundation and the superstructure

[0013] In addition to the above-mentioned problems when encountering karst caves, when drilling (digging) holes in weak ground, problems such as hole collapse and diameter shrinkage are often encountered, and casings are required to ensure normal construction of pile foundations. There are problems with the above-mentioned steel casing follow-up method

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