Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress

A technology of bonding strength and measuring device, applied in the direction of measuring device, mechanical device, instrument, etc., can solve the problem of no specific method of bonding strength between steel bar and concrete, achieve good sealing, wide application, and ensure sealing performance Effect

Inactive Publication Date: 2013-07-31
BEIJING JIAOTONG UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In summary, the existing methods can only measure the bond strength between steel bars and concrete in ordinary reinforced concrete, and there is no specific method for measuring the bond strength between steel bars and concrete under the action of prestress.

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
  • Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress
  • Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress
  • Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The present invention will be further explained below in conjunction with the drawings:

[0041] The invention first cuts the steel bar and stainless steel casing with measurement to the length required for the test (such as Picture 11 Shown) [The length of the steel bar is 230mm, and the length of the stainless steel casing is 8mm], the concrete cube specimens are poured, the specimen size is 150×150×150 (mm), and it is poured in a horizontal direction. After 24 hours of pouring, the molds were removed, and then placed in a curing room under standard conditions (room temperature 20±2°C, relative humidity above 95%), and tested after curing to age (standard curing age is 28 days). The test piece is put into the oil pressure chamber and sealed on the universal testing machine, and the oil pressure is manually increased to the required value by the SYB-2 hydraulic pump. A universal testing machine with a maximum load of 100KN is used for the measurement to ensure that the ...

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

The invention discloses a method for measuring bonding strength between reinforcing steel and concrete under the action of pre-stress. The method comprises the steps of casting a test piece, increasing oil pressure, loading and measuring a value of the bonding strength between the reinforcing steel and the concrete. The invention further provides a measuring device special for the measuring method. The device comprises a testing machine, a computer control system connected with the testing machine and a hydraulic pump system, wherein the testing machine comprises a counterforce frame; a counterforce transverse beam is arranged on the counterforce frame; an upper jaw is arranged on the counterforce transverse beam; a lower jaw is arranged at the lower end corresponding to the upper jaw; anoil pressure cavity is clamped and held between the upper jaw and the lower jaw; the test piece is installed in the oil pressure cavity; the reinforcing steel at the upper end of the test piece extends out of the oil pressure cavity and is clamped and held by the upper jaw; and a bottom plate of the oil pressure cavity is clamped and held by the lower jaw. By adopting a pressurizing method through the oil pressure cavity, the disadvantages of being incapable of applying pre-stress or unequal in aeolotropic pressure and stress concentration phenomenon and inaccurate for measurement caused by the above problems in the general method are overcome.

Description

Technical field [0001] The present invention relates to the technical field of civil engineering. Specifically, the present invention relates to a method for measuring the bond strength between steel bars and concrete under prestress, and a method for measuring the bond strength between steel bars and concrete under prestress. Measuring device. Background technique [0002] At present, among a large number of concrete structures under construction and use, prestressed steel bars, steel strands, etc. have been used more and more, and the technology is becoming more and more mature; such as bridges, silos, chimneys, large cantilever structures, etc. In addition, it is also used more and more commonly in important components such as prefabricated beams and columns. In the field of engineering reinforcement, after the structural components are reinforced, the structure is equivalent to applying prefabrication to the passive structure when the structure is subjected to the secondary 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 Patents(China)
IPC IPC(8): G01N19/04
Inventor 周长东侯平阳李慧厉春龙
Owner BEIJING JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com