A gravel/sand filter layer-porous concrete pile composite foundation and its treatment method

Abstract

The invention discloses a composite foundation composed of a rubble / sand inverted filter layer and porous concrete piles and a treatment method. The exterior structure of the foundation is the rubber / sand inverted filter layer, and the interior of the foundation is porous concrete. The pile diameter is 0.3 m-0.8 m, and the thickness of the rubble / sand inverted filter layer outside the piles is 0.2 m-0.4 m. After underwater maintenance for 28 days, the compressive strength of the porous concrete is not lower than 5 MPa, the permeability coefficient is not lower than 5 mm / s, the pile spacing is 3-5 times of the pile diameter, and the porosity rate of the porous concrete is greater than 20 percent. The treatment method of the foundation comprises the steps that according to the requirements for foundation settlement and bearing capacity, the pile diameter, the pile spacing, the foundation reinforcement range, the reinforcement depth, the pile arrangement mode, the amount of packing in pile holes and the thickness of pile top granular materials or wet clay are determined, and piles are constructed. According to the composite foundation, the problem that the porous concretes are blocked by slurry is effectively weakened; the rubble / sand inverted filter layer plays a role in water permeability and inverted filtering, and therefore the piles can be drained continuously and effectively in the composite foundation.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a gravel / sand filter layer-porous concrete pile composite foundation and a treatment method. Background technique [0002] The composite foundation composed of pile foundation composed of porous concrete materials can carry a certain vertical load when dealing with weak soil foundations, and has a certain single pile bearing capacity and composite foundation bearing capacity. The porous concrete pile body combined with gravel piles and other bulk materials The pile can take advantage of the permeable filter of the bulk material and the high strength and rigidity of the concrete pile. Chinese patent CN102296593A discloses a cylindrical concrete gravel composite pouring pile and its construction technology. The construction technology of the pile is complicated, and the internal concrete is not dense Permeable, the drainage effect of the whole pile body is not ideal. Chinese patent ...

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Problems solved by technology

[0002] The composite foundation composed of pile foundation composed of porous concrete materials can carry a certain vertical load when dealing with weak soil foundations, and has a certain single pile bearing capacity and composite foundation bearing capacity. The porous concrete pile body combined with gravel piles and other bulk materials The pile can take advantage of the permeable filter of the bulk material and the high strength and rigidity of the concrete pile. Chinese patent CN102296593A discloses a cylindrical concrete gravel composite pouring pile and its construction technology. The construction technology of the pile is complicated, and the internal concrete is not dense Permeable, the drainage effect of the whole pile body is not ideal

Chinese patent CN103452093A mentions a series composite foundation of permeable concrete gravel piles. Since the freshly mixed porous concrete is prone to segregation in water environment and vibration construction, the separation of cement slurry and aggregate results in uneven distribution of cement slurry In porous concrete, part of the pores are blocked, so that the porous concrete loses its water permeability function

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