A kind of sampling device and sampling method for cement soil at pile end at bottom expansion position of expanded bottom pile

Abstract

The invention discloses an expanded-base pile expanded-base pile tip cement soil sampling device which comprises an expanded blade, an upper soil sampling box and a lower soil sampling box. One end of the expanded blade is hinged onto a drill rod, the upper soil sampling box is fixed on the expanded blade, the lower soil sampling box is fixed on the drill rod, one end of each of the upper soil sampling box and the lower soil sampling box is open, the upper soil sampling box and the lower soil sampling box are covered to form a closed soil sampling box when the expanded blade is folded, and a cement soil sample outlet is formed in the lower end face of the lower soil sampling box and provided with a plugging bolt. A sampling method of the device includes the steps: controlling folding and expanding of the expanded blade by a hydraulic system, and expanding a base of a pile tip and stirring cement soil at the expanded base by the aid of the expanded blade; sampling pile tip cement soil samples by matching and meshing the upper soil sampling box and the lower soil sampling box when the expanded blade is folded. The device realizes sampling of flexible expanded-base pile expanded-base cement soil, and has the advantages of simplicity in operation and reliable sampling quality.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction, in particular to a bottom-expanding pile construction technology, in particular to a bottom-expanding pile end cement soil sampling device and a sampling method thereof. Background technique [0002] With the development of urbanization in our country, urban space is becoming more and more tense, so buildings are required to evolve to high-rise buildings in order to improve the efficiency of space utilization. High-rise buildings have heavy loads, and pile foundations are generally used. In order to achieve the required bearing capacity, it is often necessary to increase the bearing capacity of single piles or increase the number of piles. In general, when a single pile can provide a higher bearing capacity, it is beneficial to reduce the total cost of the project. For a specific project, improving the bearing capacity of a single pile can generally be achieved by increasing...

AI Technical Summary

Problems solved by technology

This method has low sampling efficiency and high cost. At the same time, when the pile is long, it is difficult to ensure the verticality of ordinary drilling rigs. This method is difficult to effectively take out representative samples.

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