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Embedded type deformation gauge with ultralow elastic modulus and method for assembling the embedded type deformation gauge with ultralow elastic modulus

A technology with an elastic modulus and ultra-low, applied in the field of embedded deformation gauge and its assembly, it can solve the problems of high cost, poor precision, strict measurement environment requirements, etc. Effect

Inactive Publication Date: 2015-08-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of poor accuracy, strict requirements on the measurement environment and high cost of the current deformation measuring instruments, the present invention proposes an embedded type with ultra-low elastic modulus that does not need to be corrected for deformation measurement results, has low requirements for the measurement environment, and is simple to manufacture. Deformometer and assembly method thereof

Method used

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  • Embedded type deformation gauge with ultralow elastic modulus and method for assembling the embedded type deformation gauge with ultralow elastic modulus
  • Embedded type deformation gauge with ultralow elastic modulus and method for assembling the embedded type deformation gauge with ultralow elastic modulus
  • Embedded type deformation gauge with ultralow elastic modulus and method for assembling the embedded type deformation gauge with ultralow elastic modulus

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Embodiment 1

[0027] Embodiment 1 The embedded deformation gauge with ultra-low modulus of elasticity described in the present invention includes a copper tube 1, an elastic steel sheet 2, a fixed bearing platform 3, a movable bearing platform 4, and an end flange 5. The described Copper pipe 1 is externally sleeved with rubber sleeve 11, and the outer wall of copper pipe 1 is bonded to the inner wall of rubber sleeve 11; connected; the coupling 12 is connected to the movable bearing platform 4 through countersunk screws, and the end of the movable bearing platform 4 passes through the coupling 12 and is screwed to the end flange 5; the elastic steel sheet 2 The two ends are installed on the fixed platform 3 and the movable platform 4 respectively, and at least one resistance strain gauge 21 is pasted on the surface of the elastic steel sheet 2, and the direction of the sensitive grid of the resistance strain gauge 21 is kept in the longitudinal direction of the elastic steel sheet 2 Parall...

Embodiment 3

[0043]Embodiment 3 In order to verify the measurement effect of the embedded deformation gauge (abbreviated as ESS), the early deformation (mainly manifested as self-shrinkage) of concrete caused by non-load factors is used as the measurement object, and the deformation gauge and the deformation gauge of the present invention are embedded inside. The contact method of external high-precision displacement sensor (abbreviated as CDS) commonly used in this technical field measures the free deformation of concrete synchronously.

[0044] The mix ratio of the concrete used is as follows: Portland cement with a strength grade of 52.5 515kg / m 3 ; Mixing water 155kg / m 3 ;Ordinary river sand 718kg / m 3 ; 5 ~ 16mm gravel 1032kg / m 3 ; Superplasticizer 7.21kg / m 3 . The slump of the concrete is 61mm; the slump spread is 25mm; the strength grade is C60.

[0045] The specimen used to measure the early deformation of concrete is a prism of 100mm×100mm×400mm. Before the test, the ESS was ...

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Abstract

An embedded type deformation gauge with ultralow elastic modulus and a method for assembling the embedded type deformation gauge with ultralow elastic modulus. The embedded type deformation gauge with ultralow elastic modulus includes a copper tube, an elastic steel disc, a fixed bearing platform, a movable bearing platform and an end part flange, and the copper tube is sleeved by a rubber sleeve; one end of the copper tube is fixedly connected with the fixed bearing platform, and the other end is fixedly connected with a coupling; the coupling is connected with the movable bearing platform; two ends of the elastic steel disc are mounted on the bearing platform, and at least one resistance strain gauge is pasted on the surface of the elastic steel disc; and an inner wall of a cavity of the fixed bearing platform is provided with a thermocouple, and the resistance strain gauge and the thermocouple are electrically connected with a data measuring instrument through a strain gauge outgoing line and a thermocouple lead respectively. The assembling method includes the following steps: an elastic steel sheet assembly penetrates into the copper tube, and the left end of the copper tube firmly welded to the fixed bearing platform; the coupling is inserted in the right end of the copper tube, the left end is welded to the copper tube, and the right end is fixed to the movably bearing platform; the right end of the movable bearing platform is screwed in the end part flange; and the rubber sleeve sleeves an outer side face of the copper tube. The embedded type deformation gauge with ultralow elastic modulus and the method for assembling the embedded type deformation gauge with ultralow elastic modulus have the beneficial effects of easily available materials simple assembling, convenient use, good stability and high measurement accuracy.

Description

technical field [0001] The invention relates to an embedded deformation gauge with an ultra-low elastic modulus and an assembly method thereof, belonging to the technical field of civil engineering inspection and detection. Background technique [0002] The deformation caused by various factors is one of the important indicators reflecting the basic properties of civil engineering materials and the service performance of components and structures, so it must be accurately measured. Research on measurement methods and instruments has always been valued. At present, the most widely used deformation measuring instruments are divided into two categories: contact displacement gauges (including various strain gauges) and non-contact displacement gauges. Contact displacement gauges are traditional deformation measuring instruments, which are simple to install and use, and relatively cheap. , but it is obviously not suitable for the measured body with undeveloped physical propertie...

Claims

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Application Information

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IPC IPC(8): G01B7/16
Inventor 杨杨江晨晖蔡阳倪彤元
Owner ZHEJIANG UNIV OF TECH