Spiral self-drilling steel pile capable of being reinforced through diameter increasing, and construction method of spiral self-drilling steel pile

Abstract

The invention relates to the field of foundation treatment, in particular to a spiral self-drilling steel pile capable of being reinforced through diameter increasing, and a construction method of thespiral self-drilling steel pile. The spiral self-drilling steel pile capable of being reinforced through diameter increasing comprises a spiral pile with a center shaft being provided with spiral blades, and further comprises a lengthening rod composed of one or more lengthening sections; the upper end of the spiral pile is connected with the lower end of the lengthening rod, wherein diameter-increasing guiding discs are arranged on the one or more lengthening sections in the lengthening rod; and the diameter-increasing guiding discs are each in a funnel shape, openings of the diameter-increasing guiding discs face upwards, and the bottoms of the diameter-increasing guiding discs are connected with the rod wall of the lengthening rod in a sealed mode. Through pile side grouting, slurry reaches the diameter-increasing guiding discs to form a reinforced body, the vertical limit bearing capacity, critical buckling load and transverse carrying capacity of the pile are improved, and compared with the mode for improving the bearing capacity through methods of increasing the number of the blades, the diameter of the blades and the pile length, the more economical and applicable effects are achieved so as to enable a foundation to be more stable.

Description

technical field [0001] The patent of the present invention relates to the field of foundation treatment, in particular to a diameter-expandable and reinforced spiral self-drilling steel pile and a construction method. Background technique [0002] Spiral self-drilling steel piles have wide adaptability, fast and efficient construction, small environmental impact, good overall economy, good durability and earthquake resistance. Under the call of the country to vigorously advocate environmental protection, spiral self-drilling steel piles have broad development prospect. After the foundation is reinforced by the spiral self-drilling steel pile, when the vertical load is applied, the proportion of the total side friction resistance provided by the central steel shaft is small because of the small side area. When the pile length is short, the spiral self-drilling pile is usually not considered The side resistance of the drilled steel pile contributes to the axial bearing capaci...

AI Technical Summary

Problems solved by technology

However, the scope of increasing the diameter of the helical blade is limited. If the blade diameter is too large, it will easily cause the blade to bend and deform during the load-bearing process, and increasing the diameter will not significantly increase the bearing capacity.

After increasing the length of blades or piles, relatively high requirements are placed on the torque equipment for steel pile construction. Sometimes in limited space, the construction equipment may be difficult to operate and affect the construction progress

In addition, when the helical self-drilling steel pile reinforces a thick and weak foundation, the slenderness ratio of the helical self-drilling steel pile is too large, which is prone to buckling instability

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