Method and device for measuring steel strut axial force by utilizing adhered steel sheet

Abstract

The invention relates to a method for measuring a steel strut axial force by utilizing an adhered steel sheet, and the method comprises the following steps: (1) designing a standard steel sheet and marking the optimal tensioning state frequency f and standard calculating coefficient K of the standard steel sheet; (2) choosing the required adhered steel sheet according to the marking result, installing the chosen adhered steel sheet on a steel strut at an unstressed state before installing the steel strut, then adjusting the adhered steel sheet to the optimal tensioning state, and recording the calculating coefficient K of the adhered steel sheet at the optimal tensioning state; and (3) bearing an axial pressure by the steel strut in the use process of the steel strut, measuring the frequency value fi of the adhered steel sheet at such a state, and according to an axial force formula shown in the specification, calculating and acquiring the axial force F of the steel strut, wherein E represents a steel strut elastic modulus and A represents a cross sectional area of the steel strut.

Description

technical field [0001] The invention relates to a testing method and a device in the technical field of construction engineering, in particular to a testing method and a device for measuring the axial force of a steel support by using an attached steel sheet. Background technique [0002] In the construction of deep foundation pits, the enclosure structure plus internal support system is a commonly used support form. The support system acts on the enclosure structure and bears the water and soil pressure during the construction process. It is an important structure to ensure the stability of the foundation pit. Therefore, , it is very important to make a comprehensive and accurate measurement of the stress state of the support during the excavation of the foundation pit, and issue a risk warning when necessary. [0003] After literature search, it was found that "Supporting Structure Design and Construction" written by Xu Wei and Lu Fengwu was included in Chapter 17 of "Foun...

AI Technical Summary

Problems solved by technology

[0005] In actual engineering, the currently commonly used methods have the following defects: (1) The axial force meter must be installed at the end of the steel support. Although the measured axial force value is relatively accurate, the cross-sectional area of ​​the pressure accelerometer is much smaller than the steel support, which is easy to cause damage. The enclosure structure and support lose stability under local pressure, which is the weak node of the support system, which affects the safety of the foundation pit, and this method cannot measure the eccentricity of the support axial force; (2) Install strain gauges or steel bar gauges on the steel support surface, Compared with the installation of axial force gauge, the problem of section weakening and instability is avoided

This invention improves the pressure cell axial force measurement method and avoids the weakening of the section, but it does not fundamentally improve the test method, only partial improvement, still has the problem of high cost and cannot be fully applied to each steel support

Images