Simple method for monitoring steel truss bridge static load change
A steel truss bridge, simple technology, applied in the direction of electromagnetic measuring device, electric/magnetic solid deformation measurement, etc., can solve the problems of high implementation environment requirements, high cost, and difficulty in judging the actual bearing capacity of the bridge
Pending Publication Date: 2017-01-11
南京工大桥隧与轨道交通研究院有限公司
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Problems solved by technology
[0003] The conventional method of measuring the self-weight of the bridge is mainly to use the jack to weigh. This method is very cumbersome, has high requirements for the implementation environment, and is expensive. Therefore, the bridge self-weight change is generally not monitored during the bridge maintenance process, and it is difficult to judge whether the bridge is under maintenance. The actual carrying capacity after transformation brings hidden dangers to the safety of use
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[0024] The present invention will be further described below in conjunction with specific examples.
[0025] The invention is a simple method for monitoring the static load change of a steel truss bridge, and the specific implementation steps are as follows:
[0026] Step 1: Collect and query relevant materials such as steel truss bridge design drawings and as-built drawings, establish a calculation model, conduct theoretical analysis on the structure, and determine the vertical bars and oblique bars that need to be monitored.
[0027] Step 2: Select a strain sensor that meets the requirements of the standard GB / T 13992-2010, and calibrate it.
[0028] Step 3: Before installing the strain sensor, mark the axis on each side of the vertical bar and the inclined bar, and treat the surface of the bar to ensure smoothness and cleanliness. The deviation of the installation position of the strain gauge should be controlled within 0.1mm. Finally, perform moisture-proof treatment on t...
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The invention relates to a simple method for monitoring the steel truss bridge static load change. Strain sensors are arranged on the vertical rods and the oblique rods corresponding to the support top nodes of a steel truss bridge to monitor the strain change values before and after replacing of the bridge deck slabs or bridge deck pavements and calculate the axial force change values of the vertical rods and the oblique rods so as to infer the change quantity, i.e. the weight change before and after replacing of the bridge deck slabs or the bridge deck pavements on the steel truss bridge, of the supporting reaction. The static load of the carriageway slabs and the bridge deck pavements after replacing is ensured not to be greater than the original load in maintenance and reconstruction of the bridge, and the conventional jack weighing method is quite complicated and has high requirement for the environment and high cost. The problems that the steel truss bridge weighing work is complicated and high in cost can be fundamentally solved by the simple method for monitoring the steel truss bridge static load change.
Description
technical field [0001] The invention relates to the technical field of bridge construction process monitoring and control, in particular to a simple method for monitoring static load changes of steel truss bridges. Background technique [0002] After the founding of the People's Republic of my country, a number of cross-river road-rail bridges, such as Wuhan Yangtze River Bridge, Nanjing Yangtze River Bridge, Jiujiang Yangtze River Bridge, etc., have basically similar main structure forms, and most of them show a common feature at present, that is, the main structure All have been tested and evaluated as being in a safe state, but most of them, such as road bridge roadway slabs, bridge deck pavements, and telescopic devices, have serious diseases and need to be replaced in time. In order to meet the requirements of structural bearing, it is necessary to ensure that the replaced roadway slabs and bridge deck pavement and other static loads are not greater than the original load...
Claims
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Login to View More IPC IPC(8): G01B7/16
CPCG01B7/16
Inventor朱利明蒋湘成
Owner南京工大桥隧与轨道交通研究院有限公司