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Unbalanced force testing method for curve beam bridge swiveling construction of high-speed railway

A technology for high-speed railways and testing methods, applied in static/dynamic balance testing, machine/structural components testing, measuring devices, etc., can solve problems that affect the normal force of the structure, and achieve high safety and simple operation.

Active Publication Date: 2018-09-04
CHINA FOURTH ENG OF CHINA RAILWAY SEVENTH GROUP
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Problems solved by technology

Although the current bridge swivel technology is becoming more and more mature, for different bridges, it is necessary to formulate a reasonable and feasible swivel scheme according to its structural form, construction process, site and environmental conditions, so as to ensure that the structure is sufficiently stable during the swivel process. Guarantee of safety and strength, to avoid affecting the normal force of the structure or causing an uncontrollable situation due to rotation

Method used

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  • Unbalanced force testing method for curve beam bridge swiveling construction of high-speed railway
  • Unbalanced force testing method for curve beam bridge swiveling construction of high-speed railway
  • Unbalanced force testing method for curve beam bridge swiveling construction of high-speed railway

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specific Embodiment

[0083] (1) Vertical weighing

[0084] The 45# pier T structure also has a large unbalanced moment due to the 1.53% slope in the longitudinal direction of the bridge. At the beginning of the test, after cutting off the temporary supporting I-beam, it was found that the side with a large mileage was on the ground, and the unbalanced moment was greater than the frictional moment. According to theoretical calculation, the counterweight should be 23t within the range of 29m~31m from the center of the pier to the maximum mileage. After the first weighing, the actual counterweight is 18.4t in the range of 29m to 31m in the long-distance direction. After the counterweight, the T structure of the 45# pier reaches balance, and all the legs are off the ground. At this time, the unbalanced moment is smaller than the frictional moment. After the counterweight is completed, repeat the weighing. See Table 4-2 for the reweighing results, and the load and displacement curves are as follows ...

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Abstract

The invention discloses an unbalanced force testing method for curve beam bridge swiveling construction of a high-speed railway. The method comprises: step one, preparation before testing is carried out; to be specific, a jack is installed and a displacement meter is arranged; step two, weighing testing is carried out; to be specific, after a temporary support is cut off, the jacking force of thejack is adjusted; when the read number of the displacement meter changes suddenly, the bending moment generated by the jacking force of the jack, the unbalanced torque of a swiveling body, a spherical-hinge friction moment of the swiveling body reach instantaneous balancing and the unbalanced torque of the swiveling body and the spherical-hinge friction moment of the swiveling body are calculated;and step three, a load and displacement curve is drawn and a spherical-hinge friction coefficient and an eccentric distance of the swiveling body are calculated. According to the invention, on the basis of the unbalancing weighing field testing of the swiveling body, the structure safety of the swiveling body construction stage is ensured and the construction quality is improved. Meanwhile, the experience and data are gathered for the design and construction of the similar swiveling bridges; and the basis is provided for technical management and technical assessment during the operation periods of bridges.

Description

technical field [0001] The invention relates to the technical field of bridge swivel construction. More specifically, the present invention relates to a method for testing unbalanced forces in the swivel construction of curved girder bridges for high-speed railways. Background technique [0002] The key technical issues of the swivel construction method include: (1) rotating equipment and rotating capacity; (2) guaranteeing the strength and stability of the structure during the construction process; (3) system transformation during the closing process of the structure. Although the current bridge swivel technology is becoming more and more mature, for different bridges, it is necessary to formulate a reasonable and feasible swivel scheme according to its structural form, construction process, site and environmental conditions, so as to ensure that the structure is sufficiently stable during the swivel process. Guarantee of safety and strength, to avoid affecting the normal ...

Claims

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Application Information

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IPC IPC(8): G01M1/30
Inventor 王迎军郭炜欣徐德生刘伟谭云亚夏旺张传林祁子鹏余建华
Owner CHINA FOURTH ENG OF CHINA RAILWAY SEVENTH GROUP
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