Intelligent sensing system for water stop performance of rubber sealing gaskets of subsurface structure joints

Abstract

The invention provides an intelligent sensing system for the water stop performance of rubber sealing gaskets of subsurface structure joints. In rubber sealing gaskets mounted at connecting componentjoints of a prefabricated and spliced subsurface structure, piezoelectric rubber components are embedded, and the piezoelectric rubber components are connected with wireless transmitters through controllers and data lines to form piezoelectric rubber sensors; and the piezoelectric rubber components are connected with energy storers through the controllers and the data lines to form vibration energy collectors, and the controllers are used for switching the data collection / energy storage states of the piezoelectric rubber sensors. The energy self-sufficient sensors are embedded in the sealing gaskets, contact pressure is directly measured to monitor the water stop performance, and extremely high accuracy, timeliness and reliability are achieved.

Description

technical field [0001] The invention relates to a seepage water monitoring system for underground structures, in particular to an intelligent perception system for water-stop performance of joint rubber gaskets in underground structures, which is applied to the prefabrication of immersed tunnels, shield tunnels, pipe jacking tunnels, and underground comprehensive pipe galleries. Assembled underground structure. Background technique [0002] Water leakage is a common and typical underground structure disease. The joints of prefabricated assembled underground structures are mainly sealed by laying elastic rubber gaskets. The component applies extrusion force to compress the gasket. If the compression force of the gasket exceeds the external water pressure, it can play a waterproof role. If the compression force of the gasket is insufficient, the construction deviation is too large, the joint deformation is too large during the operation period, or the gasket is loose It will ...

AI Technical Summary

Problems solved by technology

[0005] The contact pressure of the gasket is the most direct indicator for evaluating its water-tight performance. It should be monitored by a pressure sensor. At present, the core materials of the common pressure sensors are mostly metal strain gauges, silicon materials and ceramic sheets. Due to the characteristics of the materials, existing The pressure sensor can not be applied to the force monitoring of the tunnel rubber gasket, the specific reasons are as follows: (1) The gasket at the segment joint is subjected to very complicated force and large deformation, and the existing pressure sensor is easily damaged; (2) ) The rigidity of the pressure sensor and the gasket is inconsistent, resulting in uncoordinated deformation, the pressure sensor cannot accurately sense the force of the gasket, and affects the working performance of the gasket, resulting in poor water-tight performance

Since the existing pressure sensors cannot meet the needs of directly monitoring the working performance of the rubber gasket at the joint of the underground structure, at present, the displacement monitoring method is used to indirectly evaluate the working performance of the rubber gasket. The commonly used monitoring content mainly includes the joint of the segment The staggering and opening of the segment, the torsion of the segment, the sinking of the vault of the segment ring and the convergence deformation, through the above deformation monitoring data, comprehensive analysis and evaluation of the working performance of the rubber gasket, but there are the following deficiencies: (1) Displacement Monitoring is an indirect measurement method, and the accuracy of displacement monitoring is limited, so it is impossible to accurately perceive the actual force state of the rubber seal; (2) Displacement monitoring is difficult to realize automatic monitoring, and manual measurement is mostly used. The measurement frequency is low, and the rubber seal cannot be sensed in real time The working behavior of the pad cannot be early warned in real time; (3) It is necessary to monitor the overall torsion, sinking and convergence of the structure, as well as the staggering and opening of the joints. There are many monitoring contents, high monitoring costs, and heavy monitoring workload

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