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Uniaxial in-situ stock stress detection method for concrete bridges based on step-by-step drilling

A technology of stock stress and detection method, applied in the direction of measurement force, variable measurement arrangement, measurement device, etc., can solve the problems of difficult control of disturbance in the cutting process, difficult operation, high cost of structural damage, etc., and achieve simple and feasible operation and mature equipment Reliable, process-clear results

Active Publication Date: 2016-05-18
TONGJI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yang Yong and Wang Bosheng also studied the parallel groove release area, and the results showed good accuracy, but the large release area has a high structural damage cost, and the disturbance in the cutting process is not easy to control, and the actual operation is difficult.

Method used

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  • Uniaxial in-situ stock stress detection method for concrete bridges based on step-by-step drilling
  • Uniaxial in-situ stock stress detection method for concrete bridges based on step-by-step drilling
  • Uniaxial in-situ stock stress detection method for concrete bridges based on step-by-step drilling

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Experimental program
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Embodiment 1

[0025] see figure 1 , figure 1 6 is the direction of the uniaxial stress field, D and d are the outer diameter and inner diameter of the stress release ring 5 respectively, and t is the wall thickness.

[0026] A uniaxial in-situ stock stress detection method for concrete bridges based on step-by-step drill rings,

[0027] (1) The four strain gauges are evenly arranged in the four symmetrical areas near the outside of the stress release ring 5 on the surface of the concrete bridge where the release strain is most concentrated, and their long axes are all along the direction of the uniaxial force. Among them, strain gauge 1 and strain gauge 2 are used To measure the strain released axially by the stress relief ring 5, the strain gauge 3 and the strain gauge 4 are used to measure the strain released tangentially by the stress relief ring 5;

[0028] (2) Utilize the drilling rig to cut the stress relief ring 5 step by step on the surface of the concrete bridge with an outer dia...

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Abstract

The invention relates to a step-by-step drill collar based concrete bridge single-shaft in situ stock stress detection method. The step-by-step drill collar based concrete bridge single-shaft in situ stock stress detection method comprises enabling strainometers to be uniformly distributed on an external side of a bridge deck stress releasing ring to be used for measuring the stress of the bridge deck stress releasing ring; enabling a drilling machine to cut the stress releasing ring step by step on a bridge deck; standing for a period after every step of collar drilling is achieved; collecting stress data of every strainometer through a static state strain collection instrument until every step-by-step collar drilling is finished; calculating the single-strainometer single-step in situ stock stress according to the following formula; calculating according to the following formula to obtain an in situ stock stress average value, namely, a final detection value according to the following formula after the in situ stock stress detected under the step-by-step drill collar of the four strainometers. Compared with the prior art, the step-by-step drill collar based concrete bridge single-shaft in situ stock stress detection method is high in the identification accuracy of the detected concrete bridge single-shaft in situ stock stress and simple and practicable in operation.

Description

technical field [0001] The invention relates to a stress detection method, in particular to a method for detecting the uniaxial in-situ stock stress of a concrete bridge based on step-by-step drill rings, and belongs to the field of concrete bridge detection. Background technique [0002] The bridge concrete structure has a long service life. Under the comprehensive influence of prestress loss, vehicle load and environmental effects, the actual stress state is complex and difficult to calculate accurately. The real in-situ stress data is of great significance to the evaluation of bridge state and reliability. [0003] At present, scholars at home and abroad have studied similar methods. Trautner and McGinnis combined step-by-step drilling rings on the concrete surface and digital image correlation technology to detect the in-situ stock stress of concrete beams. However, the measurement object of this method is the displacement field near the ring, and its magnitude is extre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/22G01D1/02
Inventor 阮欣张煜石雪飞张吉
Owner TONGJI UNIV
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