Like Superman - Seeing through walls and concrete structures

作者：Reka Vasszi

定期监控和维护以及全面检查，确保大坝在整个生命周期内保持安全且工作状态。此外，早期发现缺陷可以防止失败。预防性操作，例如对设施状况的日常检查或修复有缺陷的溢洪道，门和阀门是大坝运营商的常规维护活动。

Reaching the ambiguous areas for inspection on the dam’s downstream face can be challenging considering the height and accessibility of the dam’s apron. To reach the valves and carry out maintenance work on the Barthe dam in France, MEIJE, an electromechanical company, and the Electricite de France (EDF), producer of renewable electricity, came up with a solution. With the help of a winch mounted on a crane (metal portic) built on the upper apron of the dam, professionals can descent down to perform maintenance on the valves.

The project was quite challenging. To construct the crane, the team had to drill20, 80-centimeter-deep holes进入钢筋混凝土，其中三层位于三个不同的深度（10、30和50厘米）距表面深处。到avoid hitting the steelgrids, the team requestedgéosudouesT是一家测量公司，可以精确找到埋藏的资产。

Tracing on the go

In accordance with the company’s principles;“特权人和工作质量”Géosudouest专家为客户提供量身定制的有效解决方案。

需要定位并避开钢网格将孔钻入大坝的上围裙，客户需要实时跟踪和想象解决方案。

géosudouest专业人士使用了莉卡（Leica）DS2000，实用程序检测雷达与c-thrue, all-in-one Ground Penetrating Radar (GPR) to precisely visualise and analyse in real time buried assets before drilling into concrete. Once the layers of steel bars were detected with the DS2000, the team used the C-thrue to confirm and double check the results. Thanks to the dual antenna polarisation of both GPR, the teamsimultaneously detected the rebars at both deep and shallow levelsand determined their exact position within a range of 80 cm depth.

“Despite the difficulty related to the dense rebars, GéoSudOuest team could detect the buried assets with high accuracy. Leica Geosystems’ solutions allowed us to properly locate the position of the rebars at each level,”Géosudouest的测量专家BouladeGérard说。

DS2000的自动位置和导航系统提高生产率和节省的调查时间for GéoSudOuest. Once data was collected, experts analysed the hyperbolic signatures with intersections to estimate the location and size of the target. After verifying the results, the team marked the surface with yellow and orange lines signing where the rebars were running at different depths.

Revealing reliable data

除非我们拥有超人的奇妙愿景，否则GPR是有效定位地下公用事业的最可靠的工具。准确的扫描和real-time analysis大坝的上层围裙使团队能够安全地定位和钻探80厘米深的孔避免了钢筋交叉在不同级别执行所需的维护工作。

The DS2000 and C-thrue revealed reliable data in real time, and thereal-timevisualisationhelped the team to make当场的最佳决定.