Full casing type long auger drilled pile driver and construction method using the pile driver

Abstract

The invention discloses a full casing long-spiral bored pile machine and a construction method. The pile machine comprises an upper power head (4), a first winch (5), a first pulling rope (6), a lower power head (8), a second winch (9) and a second pulling rope (10); the upper power head (4) and the lower power head (8) are in slide fit with a main mast (2), the first winch (5) is connected with the upper power head (4) through the first pulling rope (6), and a long spiral drill stem (3) and the upper power head (4) are fixed; the second winch (9) is connected with the lower power head (8) through the second pulling rope (10), and the lower power head (8) is provided with a full casing (12). The key of the construction method is that the long spiral drill stem (3) and the full casing (12) synchronously rotate to enter a soil body under driving of the two power heads (4). According to the pile machine and the construction method, hole collapse and water gushing are prevented, and loss of cement slurry is avoided.

Description

technical field [0001] The invention relates to pile foundation construction technology in the field of civil engineering, in particular to a full casing type long spiral drilled pile driver and a method for using the pile driver to construct a full casing type long spiral drilled pressure grouting pile. Background technique [0002] With the development of the country's economic construction and the advancement of pile foundation construction technology, the application of pile foundations on soft soil foundations is becoming more and more extensive. Among the cast-in-place pile types of existing pile foundation technology, the long auger bored pile has the advantages of no need for mud retaining wall, no soil squeezing effect, good environmental protection effect, strong penetrating power, and high construction efficiency. promotion and application. [0003] The long auger bored pile is formed by a long auger drilled pile machine. The long auger drilled pile driver in th...

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Problems solved by technology

[0005] There are following defects in the pile driver of the prior art and the method of utilizing the pile driver to drill holes into piles: 1. The hole collapses easily when the drilling rig drills in the soil layer with high groundwater level and miscellaneous fill, and the surrounding soil tends to move toward the pile. Water gushes in the hole, and when pouring concrete into the hole, the cement slurry in the concrete material is easy to penetrate into the surrounding soil and cause loss; 2. It is difficult to ensure the straightness of the insertion during the process of inserting the reinforcement cage, and the reinforcement cage is easy to insert deviation, resulting in the reinforcement cage The thickness deviation of the surrounding concrete protective layer is large

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