Envelope structure combining five (six) shaft mixing piles with precast tubular piles and construction method

Abstract

The invention relates to an envelope structure combining mixing piles with precast piles and a construction method. The mixing piles are constructed by adopting the five-shaft or six-shaft mixing pile technology, hereafter referred to as an FCW construction method. The prefabricated components combined with the mixing piles are tubular piles formed through the process of digging a city land concrete tubular pile core hole, pouring slurry and sealing the bottom, hereafter referred to as a CLP construction method. The envelope structure combining mixing piles with precast piles and the construction method have the advantages of being high in mechanical degree, low in noise and construction cost and the like. In addition, the construction period is shortened.

Description

technical field [0001] The invention relates to an enclosure structure combined with five (six) shaft mixing piles and prefabricated components and its construction method, which is mainly used in the foundation pit enclosure water stop and foundation pit enclosure in the construction of civil and industrial infrastructure . Background technique [0002] At present, two-axis mixing piles and SMW construction methods are mostly used for foundation pit enclosure and foundation reinforcement. [0003] The two-axis mixing pile is a construction method extended in the 1980s. The frame is a well-shaped frame, which walks in a tube, has extremely poor stability, low work efficiency, and high labor intensity. In addition, the power head part uses a 37kw conventional motor, and the starting power is insufficient. . The deepest pile is only 18m long, and the lower part of the drill pipe has only two blades. The mixing is not uniform, and the quality of the lower part of the pile is ...

AI Technical Summary

Problems solved by technology

[0003] The two-axis mixing pile is a construction method extended in the 1980s. The frame is a well-shaped frame, which walks in a tube, has extremely poor stability, low work efficiency, and high labor intensity. In addition, the power head part uses a 37kw conventional motor, and the starting power is insufficient.

The deepest pile is only 18m long, and the lower drill pipe has only two blades, so the mixing is not uniform, and the quality of the lower pile is difficult to guarantee. Each pile is 1.2 meters long, resulting in many overlapping cold joints, which is easy to cause water leakage and other phenomena

The disadvantage of the SMW construction method is that the cement seepage is 20%, and the water-cement ratio is 1.5-2.0 to form a pile. Due to the increase of the water-cement ratio, in order to ensure the strength of the cement, the amount of cement can only be increased

The amount of cement is large, and one-third of the soil is replaced. The soil contains cement slurry, which cannot be used as farming soil and greening soil. It can only be treated as dregs, which not only wastes materials, but also pollutes the environment, and the cost is high.

Two-axis and three-axis mixing piles are inserted with H-shaped steel and bored piles are used to retain soil on the inner wall. The cost is high and the waste of materials is serious.

[0004] Moreover, the two-axis mixing pile can only be used as a water-stop curtain and cannot act as a soil retaining function; although the SMW construction method has a certain soil retaining function, it needs to replace a large amount of mud during the construction process to pollute the environment, and inserting section steel adds difficulty to the construction. High rental fees also increase construction costs

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