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Composite foundation improving bearing capacity of barrel-shaped foundation through auxiliary pile and construction method thereof

A technology of cylindrical foundation and composite foundation, which is applied in basic structure engineering, construction, etc., can solve problems such as fan overturning, achieve the effect of improving composite bearing capacity, good pull-out bearing capacity, and improved bearing mode

Pending Publication Date: 2019-12-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially when this type of foundation is used in offshore wind power projects, in addition to bearing the structure's own weight, wave load, wind load and other cyclic loads, the horizontal force and the huge overturning moment transmitted from the top of the tower are the main forces it bears. Especially in the face of the weak soil in my country's offshore coast, it is very easy to cause the wind turbine to overturn

Method used

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  • Composite foundation improving bearing capacity of barrel-shaped foundation through auxiliary pile and construction method thereof
  • Composite foundation improving bearing capacity of barrel-shaped foundation through auxiliary pile and construction method thereof
  • Composite foundation improving bearing capacity of barrel-shaped foundation through auxiliary pile and construction method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] A composite foundation using auxiliary piles to improve the bearing performance of a cylindrical foundation, comprising a cylindrical foundation 1 and a pile foundation 2, a flange 1-2 is prefabricated on the outer side of the cylindrical foundation 1, and a grouting casing is prefabricated on the flange 1-2 1-3; prefabricated grouting pipe 3 in pile foundation 2, using flange 1-2, grouting sleeve 1-3 and concrete 5 to connect cylinder foundation 1 and pile foundation 2, and restrain the vertical direction of cylinder foundation 1 displacement. The number and size of the pile foundation 2 can be designed according to the size of the cylindrical foundation 1 and the actual working conditions; the pile foundation 2 should adopt small-diameter prestressed high-strength concrete pipe piles (PHC pipe piles) or small-diameter Under the condition of cost, it can meet the structural strength requirements of the pile foundation 2 itself and the pullout bearing capacity requireme...

Embodiment 2

[0036] In the above-mentioned embodiment 1, a composite foundation using auxiliary piles to improve the bearing performance of the cylindrical foundation is lowered. After the cylindrical foundation 1 is floated or hoisted to the predetermined site, it is lowered by the negative pressure penetration method. to the desired position and depth. Use the sea crane to drive the pile foundation 2 to the predetermined depth at the predetermined position; after the sinking is completed, use the grouting pipe 3 to pour hydraulic concrete into the grouting sleeves 1-3 on the cylindrical foundation, and wait until the concrete has sufficient strength , so that the cylindrical foundation 1 and the pile foundation 2 form an integral body and receive loads cooperatively, so as to improve the composite bearing capacity of the overall structure.

Embodiment 3

[0038] In the above-mentioned embodiment 1, when the composite foundation using auxiliary piles to improve the bearing performance of the barrel foundation is in operation, the barrel foundation 1 will also trigger the "scoop" failure mode when it bears the load transmitted from the upper structure such as the fan. , but the displacement of the cylindrical foundation 1 will be constrained by the pile foundation 2, so that the composite foundation bears the upper load together. Because both PHC pipe piles and steel pipe piles have good pull-out bearing capacity, they can well share the cylindrical foundation 1 The uplifting force is improved, thereby improving the bearing mode of the composite foundation, so that the soil and the composite foundation will not be disengaged, and the composite bearing capacity of the foundation is improved.

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Abstract

The invention discloses a composite foundation improving bearing capacity of a barrel-shaped foundation through an auxiliary pile and a construction method thereof. The composite foundation comprisesa barrel-shaped foundation body, a flange plate prefabricated on the outer side of the barrel-shaped foundation, grouting sleeves prefabricated in the barrel-shaped foundation, and pile foundations. When the composite foundation is operated, the barrel-shaped foundation can motivate a spoon-shaped failure mode while the barrel-shaped foundation bears the load transmitted from a fan and other upperstructures, displacement of the barrel-shaped foundation is restricted by the pile foundations, and thus, the composite foundation bears the upper load; due to the fact that PHC pipe piles and steelpipe piles all have the good anti-pull bearing capacity, the upward pulling force of the barrel-shaped foundation can be well shared, accordingly, the bearing mode of the composite foundation is improved, soil is not separated from the composite foundation, and the composite bearing capacity of the foundation is improved.

Description

technical field [0001] The invention belongs to the technical field of marine engineering, and in particular relates to a composite foundation which uses auxiliary piles to improve the bearing performance of a cylindrical foundation and a construction method thereof. Background technique [0002] The shape of the cylindrical foundation is mostly an inverted large-diameter cylinder with an open bottom and a closed top. It is a large-diameter cylindrical thin-shell structure, which is more suitable for soft soil foundations. This new type of marine structure is widely used abroad. It is used in marine development such as large-scale jacket offshore platform foundations and deep-water offshore platform foundations, and has begun to attract attention in China. Compared with the traditional foundation form, the cylindrical foundation has more significant advantages in saving construction cost and shortening the construction period. Therefore, it will inevitably have a broader app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/42E02D27/52E02D27/12E02D15/04E02D15/06
CPCE02D27/425E02D27/12E02D15/04E02D15/06
Inventor 刘润汪嘉钰练继建
Owner TIANJIN UNIV
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