Grouting type steel tube screw pile and construction method thereof

Abstract

The invention relates to the technical field of pile foundations and discloses a grouting type steel tube screw pile. The grouting type steel tube screw pile comprises a guiding-portion welding screwblade solid square rod or steel tube, an annular soil-squeezing device, an extending-portion steel tube, a protection wall casing pipe, a cement-based slurry and a connection steel sleeve. According to the grouting type steel tube screw pile, by means of the annular soil-squeezing device and the protection wall casing pipe, a stable pile body hole is formed in the upper portion of the steel tube screw pile during rotating construction, then grouting is performed on the interior of the protection wall casing pipe, and the grouting type steel tube screw pile is formed; on the one hand, the crosssection of a pile body is improved, the pile body stability and the structural bearing capacity are improved, on the other hand, a corrosion-resistant protection jacket is formed, and the corrosion resistance of the screw pile is improved; and accordingly the anti-bending rigidity and the structural bearing capacity of the grouting type steel tube screw pile can be improved on the basis of an existing steel tube screw pile, and the corrosion resistance of the pile can be improved to a certain degree.

Description

technical field [0001] The invention relates to the technical field of pile foundations, in particular to a grouting type steel pipe screw pile and a construction method thereof. Background technique [0002] With the rapid development of the national economy, the transmission lines of the power industry are also constantly developing. Making full use of high-tech and advanced equipment has important practical significance for strengthening the construction of the national power grid and improving economic benefits. During the construction, maintenance, emergency repair of transmission lines and the construction of overhead lines, it is inevitable to have a certain underground foundation. The existing foundation is mainly based on reinforced concrete piles, which has a long construction period, cumbersome procedures, high cost, and great damage to the local environment. In view of the shortcomings of reinforced concrete piles, the power transmission construction industry ha...

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Problems solved by technology

Therefore, when the soft soil layer is thicker, the length of the pile will increase, resulting in a large slenderness ratio of the pile and a small bending stiffness, which will cause the instability of the pile; In the deep part, due to the active water-air exchange, the corrosion of the steel is more serious, which will cause a significant decrease in the bearing capacity of the pile foundation

If the cross-section of the screw pile is increased, the drilling of the pile will be difficult and the cost will increase; spraying a protective layer on the outer surface of the steel can only play a certain role in anti-corrosion, and the instability problem caused by the small overall rigidity cannot be solved. And once the surface is damaged, it is difficult to repair on site

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