CN-121977640-A - Power engineering drainage box culvert monitoring system, construction method and monitoring method

CN121977640ACN 121977640 ACN121977640 ACN 121977640ACN-121977640-A

Abstract

The invention relates to the technical field of engineering structure health monitoring, in particular to a system for monitoring a drainage box culvert of an electric power engineering, a construction method and a monitoring method. The monitoring system comprises a monitoring element and a data processing unit, wherein the monitoring element comprises a strain sensor and a temperature sensor which are arranged on the inner side of a steel reinforcement cage of a drainage box culvert, a static level gauge which is arranged on the concrete surface of the drainage box culvert, a single-axis inclinometer which is arranged on the central axis and the side wall of a top plate of the drainage box culvert, a flow rate sensor which is fixed on the inner section of the drainage box culvert through a bracket, and the strain sensor, the temperature sensor, the static level gauge, the single-axis inclinometer and the flow rate sensor are all connected with the data processing unit. The system solves the technical problems of discontinuous monitoring, incomplete parameters, weak data association and the like in long-term health monitoring of the large-scale drainage box culvert, and realizes real-time and accurate assessment and early warning of the safety state of the box culvert.

Inventors

WANG JIN
JIAO DEHUA
Pan Shushi
CHEN WENGANG
GAO LEI
LI XUANYANG
CHEN XIANGYONG
WANG ZHAOCAI
Lu Laiying
ZHANG YUHANG
WU JI

Assignees

山东电力工程咨询院有限公司

Dates

Publication Date: 20260505
Application Date: 20260116

Claims (10)

1. The large-scale drainage box culvert monitoring system for the electric power engineering is characterized by comprising a monitoring element and a data processing unit; the monitoring element includes: The strain sensor and the temperature sensor are arranged on the inner side of the steel reinforcement cage of the drainage box culvert and are used for monitoring strain and temperature data; the static level gauge is arranged on the concrete surface of the drainage box culvert and is used for monitoring sedimentation; The single-axis inclinometer is arranged on the central axis of the top plate and the side wall of the drainage box culvert and is used for monitoring the inclination angle; The flow velocity sensor is fixed on the inner section of the drainage box culvert through a bracket and is used for monitoring the flow velocity of water flow; the strain sensor, the temperature sensor, the static level, the single-axis inclinometer and the flow rate sensor are all connected with the data processing unit.
2. The power engineering large-scale drainage box culvert monitoring system of claim 1, wherein the strain sensors comprise length direction strain sensors symmetrically arranged on the longitudinal bars of the top plate along the length direction of the box culvert, and perimeter direction sensors arranged on the top plate, the bottom plate and the side wall bars along the perimeter direction of the cross section of the box culvert.
3. The large-scale drainage box culvert monitoring system for electric power engineering according to claim 2, wherein galvanized steel wires bridged on the reinforcement cages at the expansion joints of two adjacent sections of box culverts are arranged, and one sensing point of the length direction strain sensor is fixed on the surface of the galvanized steel wires.
4. The system for monitoring the culvert in the large-scale drainage of the electric power engineering according to claim 1, wherein the temperature sensor comprises a length direction temperature sensor arranged in the longitudinal rib direction of a top plate of the culvert and a vertical direction temperature sensor arranged in the vertical rib direction of a side wall of the culvert, and a protective sleeve is sleeved outside the temperature sensor.
5. The large-scale drainage box culvert monitoring system of the electric power engineering according to claim 1, wherein the static leveling instrument comprises expansion joint sedimentation difference static leveling instruments distributed on two sides of an expansion joint of the box culvert, and single-section box culvert vertical sedimentation static leveling instruments distributed at intervals along the length direction of a single-section box culvert top plate.
6. The system for monitoring the culvert in the large-scale drainage of the electric power engineering according to claim 1, wherein the single-axis inclinometer comprises a longitudinal inclinometer with a sensitive axis parallel to the length direction of the culvert and arranged on the central axis of the top plate, and a transverse inclinometer with a sensitive axis perpendicular to the length direction of the culvert and symmetrically arranged on the left side wall and the right side wall.
7. The large-scale drainage box culvert monitoring system for the electric power engineering according to claim 1, wherein the data processing unit comprises a sensor demodulation system, a raw data optimization system, a field intelligent monitoring system and a monitoring data analysis and remote early warning platform which are connected in sequence, wherein the field intelligent monitoring system is used for calculating box culvert deformation, settlement and water flow impact force according to processed data, and the monitoring data analysis and remote early warning platform is used for comparing a calculation result with a set threshold value and carrying out early warning.
8. A method of constructing a large-scale drainage box culvert monitoring system for an electrical power engineering as claimed in any one of claims 1-7, comprising: A strain sensor and a temperature sensor sleeved with a protective sleeve are arranged on the bound box culvert reinforcement cage, and galvanized steel wires are fixed at the expansion joint; after box culvert concrete is poured and molded, a static level gauge, a single-axis inclinometer and a flow rate sensor fixed through a bracket are arranged on the surface of the concrete; summarizing the leading-out ends of the sensors to an integrated device interface, marking, welding with jumper wires, and protecting welding parts; The sensor leading-out end penetrates into the protection pipe and is led to the ground surface, and is connected with the data processing unit.
9. A method of monitoring a large-scale drainage box culvert monitoring system for an electrical power engineering as claimed in any one of claims 1-7, comprising: Acquiring signals through strain sensors and temperature sensors arranged on the inner sides of the steel bars, and performing temperature compensation on the strain signals based on the temperature signals to obtain real strain; the transverse deformation of the box culvert is calculated through the real strain obtained by the strain sensors which are symmetrically distributed, and the axial deformation of the box culvert is calculated through the real strain obtained by the strain sensors which are distributed along the length direction; collecting liquid level signals through a static level gauge arranged on the surface of the box culvert, and calculating sedimentation difference and local sedimentation of the box culvert according to the liquid level difference; acquiring inclination angle signals through a single-axis inclinometer arranged on the central axis of a box culvert roof and a side wall; Collecting water flow velocity signals through a flow velocity sensor arranged on the inner section of the box culvert; Comparing the calculated deformation data, sedimentation data, inclination angle data and flow speed data with a preset threshold value, and carrying out early warning when the data reach or exceed the threshold value.
10. The method of monitoring as set forth in claim 9, wherein calculating the sedimentation difference based on the liquid level difference comprises directly converting the liquid level difference based on the static level gauges at both sides of the expansion joint to obtain the sedimentation difference, and calculating the water flow impact force based on the flow velocity data comprises calculating the dynamic shear stress of the water flow to the wall surface of the box culvert based on the water flow velocity, the water density and the box culvert section size through a hydrodynamic formula.

Description

Power engineering drainage box culvert monitoring system, construction method and monitoring method Technical Field The invention relates to the technical field of engineering structure health monitoring, in particular to a system for monitoring a drainage box culvert of an electric power engineering, a construction method and a monitoring method. Background The large-scale drainage box culvert is a cast-in-situ reinforced concrete underground structure with large cross section size and long extension distance, and is mainly used for draining rainwater, sewage or serving as a channel of facilities such as cables and the like. The box culvert is formed by splicing a plurality of sections of prefabricated or cast-in-situ box culvert sections, and expansion joints are arranged between the sections to adapt to temperature change and uneven settlement. Because the soil box is buried in a complex geological environment for a long time and bears multiple actions such as upper soil covering load, ground live load, internal water flow flushing, temperature change and the like, the box culvert structure is easy to generate the problems of uneven settlement, local deformation, concrete cracking and the like, and the drainage function and the structural safety of the soil box are directly influenced. Therefore, the real-time and accurate monitoring of the deformation, the internal force and the environmental load of the whole life cycle of the box culvert is important. Fiber Bragg Grating (FBG) sensing technology has been applied to health monitoring of underground structures because of its advantages of electromagnetic interference resistance, corrosion resistance, easiness in networking, realization of quasi-distributed measurement and the like. The prior art discloses a comprehensive pipe rack health monitoring system based on fiber bragg gratings, which comprises distributed multi-type sensor synchronous acquisition equipment and an upper computer. In the utility tunnel, a fiber bragg grating strain sensor for monitoring the crack of the splicing seam of the concrete pipe tunnel, a fiber bragg grating static level for sedimentation monitoring, a fiber bragg grating displacement sensor for horizontal displacement monitoring and a fiber bragg grating strain sensor for monitoring the crack of the pipeline flange are arranged. The sensors are connected to the acquisition equipment, and the data are finally sent to the upper computer for processing and display. In the system, for crack monitoring of a pipe gallery splice seam, a low temperature sensitive fiber bragg grating strain sensor is arranged across the seam, eight sensors are arranged at four corners and midpoints of four sides of a rectangular section in each monitoring section, and for settlement monitoring, fiber bragg grating static leveling instruments are arranged at intervals along the trend of the pipe gallery. When the prior art is applied to long-term monitoring of large-scale drainage box culverts of electric power engineering, a plurality of problems exist, namely, firstly, the system is mainly used for monitoring the splice joints, settlement and horizontal displacement of the comprehensive pipe rack, the sensor layout scheme is relatively discrete, for example, only a limited number of point-type strain sensors are arranged on each section. For large-scale drainage box culverts with lengths up to several kilometers and dynamic water flow loads in the large-scale drainage box culverts, the discrete point type monitoring is difficult to comprehensively and continuously capture the strain distribution rules of the top plate, the side wall and the bottom plate of the box culvert along the longitudinal direction and the circumferential direction, and particularly continuous deformation characteristics such as the convergence deformation of the section of the box culvert caused by uneven sedimentation or water flow scouring cannot be accurately obtained. Second, this prior art lacks direct monitoring of critical environmental loads inside the box culvert. The core function of the drainage box culvert is drainage, the change of the internal water flow speed directly reflects the overcurrent capacity and is also a main reason for causing structural flushing and additional dynamic load, but the system does not integrate a flow speed monitoring means, so that the influence of the estimated water flow load on the structure lacks data support. In addition, each monitoring parameter of the system is relatively independent, multi-source information such as strain, settlement, inclination and water flow cannot be fused deeply, and evaluation and early warning of the overall working state of the box culvert based on multi-parameter coupling analysis are difficult to achieve. Disclosure of Invention Aiming at the defects existing in the prior art, the embodiment of the invention aims to provide a system, a construction method and a monitoring method for monitoring