Unlock instant, AI-driven research and patent intelligence for your innovation.

Anti-debonding forming method of concrete filled steel tube arch ribs

A technology of steel pipe concrete and forming method, which is applied in the direction of arch bridge, arch structure, dome structure, etc., can solve the problems of limited volume expansion of concrete, large steel pipe, unavoidable debonding of concrete and steel pipe, etc., to achieve easy promotion, The effect of less material and increased construction period

Active Publication Date: 2021-10-15
ZHENGZHOU UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the expansion agent makes the volume expansion of the concrete limited, and the high temperature makes the expansion of the steel pipe greater, so the debonding of the concrete and the steel pipe is inevitable

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Anti-debonding forming method of concrete filled steel tube arch ribs
  • Anti-debonding forming method of concrete filled steel tube arch ribs
  • Anti-debonding forming method of concrete filled steel tube arch ribs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, a geotextile bag is used as the dilator. Take the forming of an arch rib in a concrete-filled steel tube arch bridge as an example. The outer diameter of the steel pipe of the arch rib is 1200mm, and the wall thickness is 20mm. The concrete adopts micro-expansion self-compacting concrete, the strength grade is C80, the initial setting time is 6 hours, and the final setting time is 10 hours. In order to improve the anti-debonding ability between the formed steel pipe and the internal concrete, the following construction scheme is adopted:

[0027] Before erecting the arch-rib steel pipe section, geotechnical cloth bags 10 are arranged in five steel pipe sections corresponding to the arch height 1 / 4, 1 / 2, 3 / 4, and the vault, wherein the vault is as figure 1 shown. Positioning rope 8 adopts fine steel wire rope, and two ends are tied on the upper side and the lower side inner wall of steel pipe 1, are in taut state. The upper and lower ends of the g...

Embodiment 2

[0031] In this embodiment, a jack is used as the dilator. Take the forming of an arch rib in a concrete-filled steel tube arch bridge as an example. The outer diameter of the steel pipe of the arch rib is 1200mm, and the wall thickness is 20mm. The concrete adopts micro-expansion self-compacting concrete, the strength grade is C80, the initial setting time is 6 hours, and the final setting time is 10 hours. In order to improve the anti-debonding ability between the formed steel pipe and the internal concrete, the following construction scheme is adopted:

[0032] Considering that the debonding or debonding of concrete 2 and steel pipe 1 generally occurs at the vault, before erecting the arch-rib steel pipe section, set the jack 4 only in the steel pipe section corresponding to the vault, as Figure 4 shown. The jack 4 is suspended in the steel pipe 1 with a thin wire rope, and is in a horizontal state. The jack 4 is solid and has an oil inlet pipe 7. The inner diameter of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

When arch ribs are erected, a plurality of expanders are arranged in steel pipes of the arch ribs along the axes of the arch ribs; after concrete is injected into the arch ribs in a pressing mode, the expanders are expanded, an enlarged space is generated in the concrete, the concrete pressure in the arch rib sections is increased, and the steel pipes are subjected to tensile force in the circumferential direction all the time until the concrete is finally set; and then solidifiable grout is poured into the expanders, so that the expanders become a bearable part in the concrete, and forming construction of the arch ribs is completed. According to the method, disengaging and debonding between the concrete in the arch ribs and the steel pipe wall can be avoided, the added materials and cost are low, and operation is easy and efficient.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to an anti-debonding forming method for steel tube concrete arch ribs. Background technique [0002] In recent years, CFST has been widely used in super high-rise buildings and long-span bridges, and its cross-section is mainly circular. Steel pipes and concrete complement each other. On the one hand, the steel pipes are similar to stirrups, which make the concrete three-dimensionally compressed and the compressive capacity is enhanced. On the other hand, the inner filling of concrete solves the potential instability of the steel pipes. [0003] With the increase in the application of concrete filled steel pipes in actual engineering, it is found that there are gaps in many internal concrete and the inner wall of steel pipes. The gaps with large thickness are called voids, and those with small gap thicknesses are generally called debonding. The arch ribs of concrete-f...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): E04B1/30E04B1/32E01D4/00E01D21/00
CPCE04B1/30E04B1/32E01D4/00E01D21/00
Inventor 崔镇江魏建东王俊林
Owner ZHENGZHOU UNIV