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Construction method of unbonded prestressed concrete filled steel tube giant column with built-in plastic drainage pipe

A technology of steel pipe concrete, construction method, applied in the direction of columns, pillars, pier columns, etc., capable of solving problems such as buckling

Active Publication Date: 2021-04-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concrete hardens to 70% strength, stretches the unbonded prestressed steel strands, the concrete inside the pipe expands under pressure, and the outer steel pipe expands to generate hoop tension, which enhances the three-way compression restraint effect of the concrete inside the pipe, and greatly improves the concrete inside the pipe. strength, which solves the local buckling problem of steel pipes

Method used

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  • Construction method of unbonded prestressed concrete filled steel tube giant column with built-in plastic drainage pipe
  • Construction method of unbonded prestressed concrete filled steel tube giant column with built-in plastic drainage pipe
  • Construction method of unbonded prestressed concrete filled steel tube giant column with built-in plastic drainage pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] An unbonded prestressed steel pipe concrete giant column with a built-in plastic drainage pipe according to the present invention consists of a giant steel pipe column 1, concrete in the pipe 2, plastic temporary drainage pipe 3, unbonded prestressed steel strand 4, and an inner ring in the pipe. In the giant steel pipe column 1, several ring-shaped diaphragms 5 in the pipe are arranged. The holes, the unbonded prestressed steel strands 4 are evenly arranged along the periphery of the giant steel pipe column 1, the lower ends of the unbonded prestressed steel strands 4 are anchored to the bottom of the giant steel pipe column 1, and the unbonded prestressed steel strands 4 pass through The small exhaust hole of the annular diaphragm 5 in the pipe is led upwards, the upper end of the unbonded prestressed steel strand 4 is anchored on the tensioned anchor steel plate 6 in the pipe, and the concrete 2 in the pipe is filled in the cavity of the giant steel pipe column 1 Ins...

Embodiment 2

[0061] A construction method for preparing an unbonded prestressed steel pipe concrete giant column with a built-in plastic drainage pipe, comprising the following steps:

[0062] Step 1: At the construction site, the construction and installation of the giant steel pipe column 1 is carried out, and the annular diaphragm 5 inside the pipe with small exhaust holes evenly arranged along the periphery is set in the giant steel pipe column 1 at the elevation of the steel beam top surface of the floor ;

[0063] Step 2: The unbonded prestressed steel strand 4 is evenly arranged along the periphery of the giant steel pipe column 1, the lower end of the unbonded prestressed steel strand 4 is anchored to the bottom of the giant steel pipe column 1, and the unbonded prestressed steel strand 4 Through the small exhaust hole of the annular diaphragm 5 in the pipe, it is drawn upward;

[0064] Step 3: In the giant steel pipe column 1, the concrete 2 in the pipe is poured by using the con...

Embodiment 3

[0071] A 400-storey super high-rise building adopts a steel tube concrete column-reinforced concrete shear wall core tube structure, in which the bottom diameter of the steel tube concrete column is 2.5 meters, the wall thickness of the steel tube is 30 mm, the concrete in the tube is C60, and the original design requirement is jacking concrete The grouting scheme, after negotiation, was changed to the construction scheme of unbonded prestressed concrete-filled steel tube giant columns with built-in plastic drainage pipes.

[0072] At the level of the floor, two ring-shaped diaphragms in the pipe are installed in the giant steel pipe column. The width of the ring-shaped diaphragm in the pipe is 400mm, and the thickness of the ring-shaped diaphragm in the pipe is 20mm. hole.

[0073] Set 12 φ15.2 unbonded high-strength steel strands inside, the ultimate strength of the steel strands is 1860MPa, the high-strength steel strands are anchored at the bottom of the giant steel pipe c...

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Abstract

The invention discloses an unbonded prestressed steel pipe concrete giant column with built-in plastic drainage pipes. Unbonded prestressed steel strands are evenly arranged inside, the concrete in the pipe is poured, and plastic temporary drainage pipes are inserted. Before the initial setting of the concrete, Stretch the unbonded prestressed steel strands, discharge the air and excess water in the concrete, increase the density of the concrete, and improve the performance of the concrete in the pipe; when the concrete in the pipe reaches 70% strength, stretch the unbonded prestressed steel strands , the concrete in the tube expands under compression, and the outer steel tube expands to generate hoop tension, which solves the interface separation problem between the outer steel tube and the core concrete column at the initial stage of loading, actively enhances the three-dimensional compression restraint effect of the concrete in the tube, and greatly improves the concrete in the tube. Strength, which solves the local buckling problem of steel pipes in giant concrete-filled steel tube columns; prestressed concrete-filled steel tube giant columns have the advantages of high flexural bearing capacity, strong shear bearing capacity, and large lateral stiffness, which can greatly improve the seismic performance of giant columns.

Description

technical field [0001] The invention belongs to the field of building structure engineering, and in particular relates to a construction method of a non-adhesive prestressed steel pipe concrete giant column with a built-in plastic drainage pipe. Background technique [0002] As urban populations grow rapidly, supertall buildings have become symbols of a nation's ethos and the rise of a city's economy. As the crystallization of modern construction technology, super high-rise buildings have driven the development of the national economy, greatly improved the degree of urbanization, and created unlimited value by using limited land resources. [0003] Super high-rise buildings usually use concrete-filled steel tube column-core tube structure or giant frame column-core tube structure structure. With the increase of floors, the cross-sectional size of steel tube concrete column continues to increase, forming a steel tube concrete mega-column structure. [0004] Concrete-filled s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C3/34C04B40/00
CPCC04B40/00E04C3/34
Inventor 徐文平陈凯戴航朱筱俊孙逊张先龙焦安亮彭勋王甜刘洋陈旭周军艳徐皖南
Owner SOUTHEAST UNIV