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Method for reinforcing steel pipe compression resistance

A technology of compressive performance and steel pipes, which is applied in the direction of construction and building construction, can solve the problems that the cables occupy a large space, are not suitable, and the cables are easy to be damaged, so as to improve the efficiency of strength utilization, save steel, and strengthen The effect of compressive properties

Inactive Publication Date: 2017-10-24
DONGFENG DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The disadvantage of this method is that the cables will take up a lot of space, and too many cables are easy to be damaged, so it is not suitable for construction operations in a small space

Method used

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  • Method for reinforcing steel pipe compression resistance
  • Method for reinforcing steel pipe compression resistance

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0012] Such as figure 1 and 2 As shown, the steel pipe of the present invention is made up of inner core pipe 2 and steel pipe 1, and the corresponding position on inner core pipe 2 and steel pipe 1 is provided with pin shaft installation hole 3, under normal temperature condition (being room temperature), the length of inner core pipe 2 L2 is equal to the length L1 of the steel pipe 1 at room temperature, and the outer diameter R2 is greater than the inner diameter r1 of the steel pipe 1 at room temperature. After the inner core pipe 2 is treated with liquid nitrogen, the length L2 of the inner core pipe 2 is smaller than the length L1 of the steel pipe 1 , and the outer diameter R2 is smaller than the inner diameter r1 of the steel pipe 1 .

[0013] Before assembly, put the inner core tube 2 in liquid nitrogen and soak it for a period of tim...

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Abstract

The invention relates to the technical field of prestress steel structures, in particular to a method for reinforcing steel pipe compression resistance. An inner core pipe with the outer diameter R2 being no smaller than the inner diameter of a steel pipe is subjected to liquid nitrogen treatment and then assembled into the steel pipe under the room temperature, the steel pipe is subjected to standing till the steel pipe and the inner core pipe recover to the room temperature, and radial expansion force towards the steel pipe exists on the inner core pipe. Through the thermal expansion and contraction principle, the inner core pipe is subjected to liquid nitrogen treatment and then sleeved with an outer pipe. After recovering to the room temperature, the inner core pipe applies pretension force on the steel pipe due to thermal expansion, and the compression resistance of the circular steel pipe can be effectively reinforced.

Description

technical field [0001] The invention relates to the technical field of prestressed steel structures, in particular to a method for enhancing the compressive performance of steel pipes. Background technique [0002] The existing technical method for improving the compressive performance of steel structures by applying prestress is mainly the cable method. The cable method is to arrange different types of cables around the rods, and the cables and the rods are connected by struts. Use tensioned cables to generate pre-tension; or use the pre-tension of the cables to impose constraints on the compression bar, reduce the calculated length of the compression bar, and increase the compression resistance of the compression bar. The disadvantage of this method is that the cables will occupy a large space, and too many cables are easy to be damaged, which is not suitable for construction operations in a small space. Contents of the invention [0003] In order to solve the above te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04B1/24
CPCE04B1/24
Inventor 段潇川朱尚之
Owner DONGFENG DESIGN INST
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