Bridge pier bearing condition survey and seismic reinforcement design system

Abstract

The purpose is to provide a bridge pier bearing condition survey and seismic reinforcement design system that allows for the design of seismic reinforcement devices based on information about the shape distortion and surface condition of the structure itself, when measuring the three-dimensional shape of high places and extremely narrow areas. [Solution] This includes measuring the three-dimensional surface shapes of the pier and girder surfaces, and calculating the flatness (a tolerance indicating how flat the surface is) in the virtual plate region VA for the pier side and girder bottom surfaces, respectively, at all possible mounting positions (XY). Furthermore, the flatness (a tolerance indicating how flat the surface is) is calculated for the side surface of the bridge pier along a predetermined Z-axis and the bottom surface of the bridge girder near that Z-axis. The system is characterized by displaying a 3D image generated from acquired three-dimensional measurement data, overlaying the corresponding zones of the area where seismic reinforcement devices are to be installed, and displaying the flatness evaluation for each zone as an appendix.

Claims

1. A bridge pier bearing condition survey and seismic reinforcement design system characterized by including a step of measuring the three-dimensional surface shape of the bridge pier surface and bridge girder surface, and calculating the flatness (tolerance indicating how flat the surface is) in the virtual plate area VA of the bridge pier side surface and bridge girder bottom surface, respectively, at all possible mounting positions (XY).

2. The flatness (a tolerance indicating how flat the surface is) is calculated for the side surface of the bridge pier along a predetermined Z-axis and the bottom surface of the bridge girder near that Z-axis. The bridge pier bearing condition survey and seismic reinforcement design system according to claim 1, characterized in that, in the 3D image display plotted from acquired three-dimensional measurement data, the corresponding zones of the area to be installed for seismic reinforcement devices are superimposed and the flatness evaluation of each zone is displayed as an appendix.

3. The bridge pier bearing condition survey and seismic reinforcement design system according to claim 2, characterized in that it displays the reinforcement strength when reinforced by each seismic reinforcement device in multiple corresponding zones, based on input information of the number of seismic reinforcement devices and the area to be installed.

4. Based on the measurement results of the three-dimensional shape, The degree of strain (the continuity of the surface normal indicating how much the target surface is distorted or has cracks) above a threshold is calculated for the side surface of the bridge pier along a predetermined Z-axis and the bottom surface of the bridge girder near that Z-axis. This includes a step of extracting areas where it is difficult to properly install seismic reinforcement devices. The bridge pier bearing condition survey and seismic reinforcement design system according to claim 1, characterized in that, in the 3D image display obtained from the three-dimensional measurement data, NG zones are superimposed as areas where it is difficult to install seismic reinforcement devices, and an evaluation of the difficulty of installation for each zone is displayed as an appendix.

5. The process includes an input step for determining whether the bridge pier bearing design falls under one of the following classifications: standard bearing type, bracket type, or bar fixing type, and for inputting basic specifications including reinforcement strength, device mounting surface, and fixing bolt strength for each classification, and a step for calculating the reinforcement strength when reinforcement is performed in the corresponding zone of the area to be installed of the seismic reinforcement device, based on this input information. The bridge pier bearing condition survey and seismic reinforcement design system according to claim 1, characterized in that, in a three-dimensional image display plotted from acquired three-dimensional measurement data, the corresponding zones of the area to be installed for seismic reinforcement devices are superimposed, and the reinforcement strength when seismic reinforcement devices are installed in each zone is displayed as an appended indicator.

6. The process further includes the steps of estimating the shape of areas where shape identification by three-dimensional measurement was not possible, and estimating and displaying a virtual installation state based on the symmetry of the seismic reinforcement device, based on the three-dimensional shape of the area that could be measured and the input information of the classification type in the 3D image display that plots the acquired three-dimensional measurement data, The bridge pier bearing condition survey and seismic reinforcement design system according to claim 1, characterized in that it displays the reinforcement strength when reinforced by each seismic reinforcement device in multiple corresponding zones based on the acquired basic shape of the bearing structure.

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