A bored composite pile structure under the geological conditions of karst cave/soil cave

A technology of geological conditions and composite piles, applied in the direction of foundation structure engineering, sheet pile walls, buildings, etc., can solve the problem of large concrete filling coefficient, achieve the effect of reducing the amount, reducing the cost, and reducing the filling coefficient

Active Publication Date: 2016-05-25
YUNNAN JIANTOU FOUND ENG CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the difficulties in the construction of bored piles under the geological conditions of karst caves / soil caves, and provide a method that can effectively solve the problem that the concrete filling coefficient is too large during the construction of cast-in-situ piles under the geological conditions of karst caves (soil caves), and can effectively Bored composite pile structure under the geological conditions of karst caves (soil caves) to reduce the cost of single piles and ensure the quality of piles

Method used

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  • A bored composite pile structure under the geological conditions of karst cave/soil cave
  • A bored composite pile structure under the geological conditions of karst cave/soil cave
  • A bored composite pile structure under the geological conditions of karst cave/soil cave

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Example 1 :Such as figure 1 , 2 , 3, 4, and 5, prefabricate concrete square piles with a side length of 600mm at the construction site according to the bearing capacity requirements, and maintain them naturally. Cement, clay and water are used as raw materials to make clay cement slurry after mixing and filtering. Then drill a hole with a drilling machine, and the diameter of the hole is 200mm longer than the prefabricated pile side. After clearing the soil in the borehole, the prefabricated pile 2 is implanted into the borehole with a hoisting machine, and finally the clay cement slurry 4 is poured into the hole with a grouting pipe. Inject the gap between the reinforced concrete prefabricated pile and the borehole so that the side friction resistance of the prefabricated pile can be exerted. During operation, the center of the prefabricated pile should coincide with the center of the borehole to meet the design requirements.

Embodiment 2

[0048] Example 2 :Such as figure 1 , 2 , 3, 4, and 5, prefabricated prestressed concrete pipe piles with a diameter of 600mm and a wall thickness of 100mm were prefabricated at the construction site according to the design bearing capacity requirements, and naturally maintained. Then cement, clay and water are used as raw materials, and clay cement slurry is made after mixing and filtering according to national standards. Then use a drilling machine to form a hole. The diameter of the drilling hole is 200mm larger than that of the prefabricated pile. The gap between the piles can be used to make the side friction resistance of the pile body play a role. The center of the prefabricated pile should coincide with the center of the borehole.

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Abstract

The invention discloses a drilled composite pile structure under geological conditions of karst caves / soil caves, and belongs to the technical field of building pile foundation engineering. The invention consists of boreholes, prefabricated piles, cages, clay cement slurry, grouting pipes, karst caves (soil caves), cage longitudinal reinforcement, cage stirrups and geotextiles. The construction of bored cast-in-situ piles under the geological conditions of karst caves often has great difficulties. The method of drilling can be used to implant prefabricated piles, and then clay cement slurry is filled between the prefabricated piles and the boreholes. That is: firstly, drill holes at the designed pile position, and at the same time, fix the protective cage at the corresponding position on the prefabricated pile according to the burial depth of the karst cave (soil cave) under the pile position. It consists of ring-shaped cage stirrups and geotextiles around the stirrups; then the prefabricated piles are hoisted into the holes to ensure that the center of the prefabricated piles coincides with the center of the drilled hole; finally, the clay cement slurry is injected into the hole through the grouting pipe. In the gap between the pile and the drilled hole, the drilled composite pile is formed after the clay cement slurry is solidified and stabilized.

Description

technical field [0001] The invention relates to a drilled composite pile structure under geological conditions of karst caves (soil caves), and belongs to the field of building pile foundation engineering. Background technique [0002] Karst caves refer to soluble rock formations, such as dolomite, limestone, dolomitic limestone, gypsum, rock salt, etc., after the chemical and mechanical action of water, grooves, cracks, cavities and surface depressions caused by the collapse of the top of the cavity, Depression and other phenomena and their functions. Soil cave is a geological phenomenon that the surface subsides due to the dissolution and erosion of the upper layer by surface water and groundwater. [0003] With the development of our country's social and economic construction and the acceleration of urbanization, the urban land is becoming increasingly tense, and cities are constantly asking for development space from the air and underground. As a result, the superstruc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/50
Inventor 杨世相奚晶何雄兵吕家保
Owner YUNNAN JIANTOU FOUND ENG CO LTD
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