Rotary-digging combined pile-forming construction method in complicated geological conditions

Abstract

The invention provides a rotary-digging combined pile-forming construction method in complicated geological conditions. The method comprising the following steps of: firstly, positioning a pile foundation; secondly, positioning a steel protecting barrel; thirdly, sinking the steel protecting barrel; fourthly, when the steel protecting barrel penetrates through a boulder layer without encountering the boulder, sinking the steel protecting barrel to the design elevation by using a vibration hammer; fifthly, starting a rotary digging and drilling machine to perform rotary digging and drilling at the inner side of the steel protecting barrel; sixthly, hoisting an impacting and catching hammer by a hoist, and downwards hammering and impacting the boulder by the impacting and catching hammer; seventhly, starting the rotary digging and drilling machine to continuously perform rotary digging and drilling to the design elevation; eighthly, fishing slag from the bottom of a hole; ninthly, checking and accepting a final hole; tenthly, aligning the skeleton of a steel reinforcement cage to the opening of the hole and slowly hoisting into the hole by the hoist; eleventhly, secondly cleaning the bottom; twelfthly, concreting; and thirteenthly, after primarily setting the concrete, lifting up the steel protecting barrel by the hoist. The method has the advantages of high safety and reliability, strong stratum adaptability and high construction progress and is suitable for the pile foundation engineering in cities with complicated geological conditions.

Description

technical field [0001] The invention relates to a foundation construction method, in particular to a pile foundation construction method. Background technique [0002] In the pile foundation engineering in urban areas with narrow sites, high environmental protection requirements, and complex geology, the foundation construction will encounter the following problems. 1. In pile foundation projects in urban areas under the geological conditions of gravel-containing sand layer, boulder-containing layer, and high groundwater level, the conventional mud retaining wall rotary digging hole-forming process is easy to expand holes in the gravel-sand layer. The boulder-containing layer will encounter boulders and cannot be drilled into the hole; 2. The conventional mud retaining wall rotary digging process requires mud, and there is no mud preparation and storage site for the pile foundation project in the urban area with a small site (site Mud pools cannot be arranged on the site of...

AI Technical Summary

Problems solved by technology

1. In pile foundation projects in urban areas under the geological conditions of gravel-containing sand layer, boulder-containing layer, and high groundwater level, the conventional mud retaining wall rotary digging hole-forming process is easy to expand holes in the gravel-sand layer. The boulder-containing layer will encounter boulders and cannot be drilled into the hole; 2. The conventional mud retaining wall rotary digging process requires mud, and there is no mud preparation and storage site for the pile foundation project in the urban area with a small site (site Mud pools cannot be arranged on the site of pile foundation engineering in narrow urban areas)

[0003] That is to say, with the construction and development of the city, the construction site in the urban area is becoming narrower and narrower, and the geological conditions have become more complex after artificial transformation. In addition, the requirements for environmental protection and civilized construction are becoming more and more High, so the conventional pile-forming process is often not suitable for complex geological engineering in the city

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