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Composite foundation composed of rubble/ sand inverted filter layer and porous concrete piles and treatment method

A technology of porous concrete and composite foundation, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of porous concrete losing water permeability, easy segregation of porous concrete, unsatisfactory drainage effect of pile body, etc., to achieve pore connectivity Good effect, moderate plastic viscosity, small yield stress

Inactive Publication Date: 2014-07-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Composite foundation composed of rubble/ sand inverted filter layer and porous concrete piles and treatment method
  • Composite foundation composed of rubble/ sand inverted filter layer and porous concrete piles and treatment method
  • Composite foundation composed of rubble/ sand inverted filter layer and porous concrete piles and treatment method

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Experimental program
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Effect test

Embodiment 1

[0056] A certain project is located in the alluvial plain of the Yellow River, which belongs to the yellow flood zone. Geological conditions from top to bottom are silt, clay, silt, clay. The groundwater level is about 3m, and the groundwater is very abundant. In order to reduce the post-construction settlement and ensure the stability of the building, the design uses gravel / sand filter layer-porous concrete pile composite foundation to treat the soft soil foundation.

[0057] like figure 1 , 2 As shown, a gravel / sand filter layer-porous concrete pile composite foundation includes a pile body, and the outside of the pile body is a gravel / sand filter layer, and the gravel / sand filter layer can prevent mud from penetrating into the porous concrete pile , without losing drainage. The interior is made of porous concrete material, which ensures water permeability and has a certain strength and rigidity, which is conducive to increasing the speed of pipe removal, reducing distu...

Embodiment 2

[0067] A project uses gravel / sand filter layer-porous concrete pile composite foundation for treatment.

[0068] A gravel / sand filter layer-porous concrete pile composite foundation, which includes a pile body, and the outside of the pile body is a gravel / sand filter layer, and the gravel / sand filter layer can prevent mud from penetrating into the porous concrete pile, while not Loss of drainage. The interior is made of porous concrete material, which ensures water permeability and has a certain strength and rigidity, which is conducive to increasing the speed of pipe removal, reducing disturbance to the soil around the pile, and improving the bearing capacity of the composite foundation. A gravel / sand filter combined with a porous concrete material forms a composite foundation.

[0069] The foundation treatment steps are as follows:

[0070] The piles are arranged in a square image 3 As shown, according to the mechanical construction conditions, the pile diameter is 0.3m,...

Embodiment 3

[0078] A project design uses gravel / sand filter layer-porous concrete pile composite foundation to treat the foundation.

[0079] A gravel / sand filter layer-porous concrete pile composite foundation, which includes a pile body, and the outside of the pile body is a gravel / sand filter layer, and the gravel / sand filter layer can prevent mud from penetrating into the porous concrete pile, while not Loss of drainage. The interior is made of porous concrete material, which ensures water permeability and has a certain strength and rigidity, which is conducive to increasing the speed of pipe removal, reducing disturbance to the soil around the pile, and improving the bearing capacity of the composite foundation. A gravel / sand filter combined with a porous concrete material forms a composite foundation.

[0080] The foundation treatment steps are as follows:

[0081] The piles are arranged in a square image 3 As shown, according to the mechanical construction conditions, the pile ...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/08E02D3/10
Inventor 葛智张宏博孙仁娟宋修广黄大伟胡益彰王原原魏姗姗
Owner SHANDONG UNIV
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