In-situ mixing steel tube pile construction system and method for coral reef geology

Abstract

The invention discloses a in-situ mixing steel tube pile construction system and method for coral reef geology. The in-situ mixing steel tube pile construction system for the coral reef geology comprises a steel tube pile, a rotating power device, a grouting pipeline and a base expanding drill bit, wherein the steel tube pile comprises an upper standard section and a lower diameter expanding section which are formed in an integrated manner, the side face of the steel tube pile is provided with multiple open holes, the rotating power device is connected with a drill stem which is a hollow rod.The in-situ mixing steel tube pile construction method for the coral reef geology comprises the steps that preparation is conducted; drilling is conducted, wherein when the base expanding drill bit drills into the diameter expanding section at the bottom of the steel tube pile, the diameter expanding drill bit expands the diameter and continues drilling; solidification slurry is poured into the hole base through the drill stem, the solidification slurry and coral reef sand are evenly mixed under the rotating and mixing action of the diameter expanding drill bit driven by rotation of the drillstem, and then the solidification slurry-coral reef sand mixture fills the inside and outside of the standard section through the open holes on the steel tube pile. The in-situ mixing steel tube pileconstruction method for the coral reef geology combines the construction methods of an in-situ mixing pile and a steel tube pile and integrates the three work procedures of drilling, pile driving andgrouting, and therefore the in-situ mixing steel tube pile construction system and method for the coral reef geology have the advantages that the bearing capacity is high, the construction efficiencyis high, and the construction cost of a project is low.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction. More specifically, the present invention relates to an in-situ stirring steel pipe pile construction system and method applied to coral reef geology. Background technique [0002] Driven steel pipe piles have low cost and fast construction process, and are widely used in offshore engineering. Although the technology related to driving steel pipe piles is relatively mature, in coral reef formations, the piling process will cause damage to fragile particles and soil structure, resulting in very low side friction resistance of steel pipe piles, which will lead to "sliding piles" or The vertical bearing capacity does not meet the design requirements. Offshore projects in the South China Sea, the Red Sea, the western Mediterranean, Western Australia, and western India have all encountered such problems. At present, drilling and grouting steel pipe piles are generally used abroa...

AI Technical Summary

Problems solved by technology

Although this method solves the problem of low side friction of steel pipe piles, it has many procedures, long construction period and high cost, and cracks are easy to occur after the solidified slurry is consolidated

Post-grouting of driven steel pipe piles can also solve this problem to a certain extent, but it is difficult to ensure the grouting coverage, the pile side friction is unstable, and the pressure grouting may cause certain damage to the soil structure, which reduces the its carrying capacity

At the same time, there are often cap rocks or highly consolidated soils on the geological surface of coral reefs, and the steel pipe piles are prone to curling during the driving process, resulting in the overall scrapping of the steel pipe piles

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