Underwater large particle size porous concrete pile and its composite foundation treatment method

Abstract

The invention discloses an underwater large-particle-diameter porous concrete pile. Raw materials of the concrete pile comprise cementing materials (cement and micro-silicon ash powder), aggregates, water and a thickening agent. The mass ratio of the cementing materials to the aggregates is 0.18-0.23, wherein the aggregates are formed by matching 0 percent-25 percent of rubbles with the particle diameter being 5 mm-10 mm to 75 percent-100 percent of rubbles with the particle diameter being 10 mm-20 mm. The mass ratio of the water to the cementing materials is 0.25-0.35. The mass ratio of the thickening agent to the cementing materials is 0.02-0.04. The porosity rate of concrete used for the pile is greater than 15 percent, and the permeation coefficient is 5 mm / s-35 mm / s. Under the condition of underwater maintenance, compressive strength is 8 MPa-20 MPa, and the water and land strength ratio is greater than 75 percent. The slump rate of the concrete used for the pile is greater than or equal to 15 cm. Meanwhile, the invention further discloses a treatment method for a composite foundation using the concrete pile.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to an underwater large-diameter porous concrete pile composite foundation and a processing method thereof. Background technique [0002] Porous concrete is a concrete with water-permeable and air-permeable functions composed of the concrete solid part skeleton and a series of connected pores. Existing porous concrete aggregates are mostly composed of crushed stones with a particle diameter of 5-10 mm. Studies have shown that when the particle size of porous concrete aggregates ranges from 5-10 mm and the gradation is poor, the porosity of porous concrete is low. When a certain volume After the mud-rich fluid passes through the porous concrete, the connected pores of the porous concrete will be blocked, and the water permeability effect will be greatly reduced. In severe cases, the porous concrete will lose the water permeability effect. [0003] In addition, the freshly mixed porous ...

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Problems solved by technology

Excessive vibration in the process of vibrating the immersed tube will bring two adverse consequences: 1) The aggregate and cement slurry in the freshly mixed porous concrete will also be separated under the interference of external force, resulting in the local pores of the porous concrete being blocked by the cement slurry, resulting in The entire pile structure loses its drainage function, which will also weaken the bearing capacity of the single pile of porous concrete piles and the bearing capacity of the composite foundation; Drainage of the pile, because the permeability coefficient of the disturbed soil will become smaller

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