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CN-119785531-B - Hydropower station diversion tunnel undercut damage monitoring and early warning device

CN119785531BCN 119785531 BCN119785531 BCN 119785531BCN-119785531-B

Abstract

The invention relates to a monitoring and early warning device for erosion damage of a diversion tunnel of a hydropower station, which comprises a slag collecting pool arranged in a pressurized tunnel, wherein a rock penetrating signal transmitter and a bottom plate are arranged in the slag collecting pool, the rock penetrating signal receiver is arranged outside a rock body and is in wireless communication connection with the rock penetrating signal transmitter, and a switch is arranged at the bottom of the bottom plate and is used for triggering the rock penetrating signal transmitter. The method has the advantages that the out-of-limit information of the sediment accumulation amount of the sediment accumulation pool is transmitted to the outside in time, the purposes of alarming the running state of the diversion tunnel and disasters are achieved, and equipment on the downstream side of the diversion tunnel is convenient to take disaster prevention measures in advance.

Inventors

  • HU ZELIN
  • LIU CHENG
  • HUANG SHENGJIAN
  • ZHU WENFU
  • CHEN YAN
  • LI WEITONG
  • ZHENG ZHICHAO
  • ZHAN MINGQIANG
  • Lian Enmin
  • CHEN JIAZHEN
  • LIAN YUAN

Assignees

  • 国网福建省电力有限公司
  • 福建水口发电集团有限公司

Dates

Publication Date
20260512
Application Date
20241219

Claims (10)

  1. 1. The utility model provides a power station diversion tunnel draws and corrodes destruction monitoring early warning device, including seting up in collection slag pool (200) of pressure tunnel, its characterized in that: A rock penetrating signal emitter (400) is arranged in the slag collecting tank (200), and a bottom plate (300) is arranged through a supporting spring; the rock penetrating signal receiver (100) is arranged outside the rock body and is in wireless communication connection with the rock penetrating signal transmitter (400); the switch (4) is arranged at the bottom of the bottom plate (300) and is used for triggering the rock penetrating signal transmitter (400); The sand is piled up above the bottom plate (300) and presses down the bottom plate (300), the piston rod (12) drives the first piston block (11) to descend, hydraulic oil in the liquid outlet cavity of the telescopic hydraulic rod (1) is conveyed to the flow divider (6) through a hose, one half of the hydraulic oil is conveyed to the inner cavity of the liquid storage cylinder (2) through the flow divider (6), and the other half of the hydraulic oil is conveyed to the first cavity of the adjusting cylinder (3) through the flow divider (6), so that the trigger plate (5) is driven to move upwards to be close to the switch (4); The hydraulic oil in the inner cavity of the liquid storage cylinder (2) is pushed into the regulating pipe (71) under the action of the elastic force of the spring (22), and the hydraulic oil in the regulating pipe (71) slowly flows through due to the small pore diameter of the overflow pore (75), so that the hydraulic oil in the regulating pipe (71) is discharged outwards to the second cavity of the regulating cylinder (3) to push and drive the trigger plate (5) to slowly move downwards for resetting.
  2. 2. The hydropower station diversion tunnel erosion damage monitoring and early warning device according to claim 1 is characterized in that a telescopic hydraulic rod (1) is arranged between the bottom wall and the bottom plate (300) in the slag collecting tank (200).
  3. 3. The hydropower station diversion tunnel erosion damage monitoring and early warning device according to claim 2, wherein an adjusting cylinder (3) is arranged at the bottom of the bottom plate (300), and the adjusting cylinder (3) is used for driving a trigger plate (5) at the output end of the adjusting cylinder to be close to or far away from the switch (4).
  4. 4. The hydropower station diversion tunnel erosion damage monitoring and early warning device according to claim 3, characterized in that a liquid storage cylinder (2) is arranged at the bottom of the bottom plate (300), a liquid outlet cavity of the telescopic hydraulic rod (1) is divided into two paths through a flow divider (6) and is connected with an inner cavity of the liquid storage cylinder (2) and a first cavity of the adjusting cylinder (3) in a one-way mode, the inner cavity of the liquid storage cylinder (2) is connected with a second cavity of the adjusting cylinder (3) in a one-way mode through a time delay structure (7), and the first cavity and the second cavity of the adjusting cylinder (3) are connected with a liquid inlet cavity of the telescopic hydraulic rod (1).
  5. 5. The hydropower station diversion tunnel erosion damage monitoring and early warning device according to claim 4 is characterized in that a second piston block (21) is arranged in the inner cavity of the liquid storage cylinder (2), and a spring (22) is arranged between the inner side wall of the liquid storage cylinder (2) and the second piston block (21).
  6. 6. The hydropower station diversion tunnel erosion damage monitoring and early warning device according to claim 4, wherein the delay structure (7) comprises a regulating pipe (71) with a liquid inlet and a liquid outlet, a fixing plate (72) is arranged in the regulating pipe (71), and overflow fine holes (75) are formed in the fixing plate (72).
  7. 7. The hydropower station diversion tunnel erosion damage monitoring and early warning device according to claim 6, wherein the overflow fine holes (75) on the fixed plate (72) are provided with a plurality of groups and different in pore diameter, the worm wheel (73) is rotatably connected to the fixed plate (72), the worm wheel (73) is provided with a plurality of groups of overflow fine holes (75), and the worm wheel (73) rotates relative to the fixed plate (72) so that a group of overflow fine holes (75) with the same pore diameter are aligned.
  8. 8. The hydropower station diversion tunnel erosion damage monitoring and early warning device according to claim 7 is characterized in that a worm (74) meshed with a worm wheel (73) is rotatably connected to the adjusting pipe (71), and one end of the worm (74) extends to the outer side of the adjusting pipe (71).
  9. 9. The hydropower station diversion tunnel erosion damage monitoring and early warning device according to claim 8, wherein the worm wheel (73) comprises a parallel section (732) and a concave section (733) which are sequentially connected to form a closed loop, and when the concave section (733) of the worm wheel (73) is meshed with the worm (74), the worm wheel (73) is aligned with a corresponding overflow pore (75) on the fixed plate (72).
  10. 10. The hydropower station diversion tunnel erosion damage monitoring and early warning device according to claim 4 is characterized in that a liquid outlet cavity and a liquid inlet cavity of the telescopic hydraulic rod (1) are isolated through a first piston block (11), and a first one-way valve (13) is arranged on the first piston block (11) so that the liquid inlet cavity flows to the liquid outlet cavity in a one-way mode.

Description

Hydropower station diversion tunnel undercut damage monitoring and early warning device Technical Field The invention relates to the technical field of real-time monitoring of the running state of a pressurized long diversion tunnel, in particular to a monitoring and early warning device for the erosion damage of the diversion tunnel of a hydropower station. Background The permanent support of the pressurized diversion tunnel of the hydropower station usually adopts three forms of lining-free, anchor spraying support and reinforced concrete lining. In order to prevent water flow bed load and non-lining hole section falling blocks in the tunnel from entering the water turbine, a slag collecting pit is arranged at the front end of the reinforced concrete lining section. The water entering the tunnel is generally filtered through the inlet slag collecting pool and the rotten dirty grid, the non-lining tunnel section of the diversion tunnel is easily eroded and damaged under the action of water flow, most of the sand and stones which are scraped off enter the slag collecting pool through the runner, and therefore the change of the amount of the sand and stones deposited in the slag collecting pool can be used as a key index for evaluating the running state of the non-lining section of the diversion tunnel. Timely acquisition of the amount of silted sand in the slag collecting pool is a precondition for realizing disaster early warning of the non-lining section of the diversion tunnel. In the prior art, a manual measurement method (carried out once a year) is generally adopted, so that the condition of erosion damage of the diversion tunnel cannot be monitored and estimated periodically or in time in emergency. The monitoring method of the sedimentation at the current stage mainly comprises a manual depth rule method, a sonar detection method, a radar method, a Time Domain Reflectometer (TDR) method and the like. Signal transmission is generally classified into a wired communication system and a wireless communication system. A wired communication system is a communication system that relies on one wire to connect the communication of information between two communication nodes. Wireless communication systems do not use cables for information transmission, but rather employ stronger electromagnetic waves for signal transmission over a propagation medium. The measurement depth of the artificial depth gauge method is often limited by many aspects of topography, weather environment, actual measurement depth and the like, sonar and radar are easy to interfere, low in precision and poor in stability, equipment cost of a Time Domain Reflectometer (TDR) is too high, and a main sensor element equipped with the artificial depth gauge method is easy to damage in an extreme environment. The wireless communication transmission range is large, but the pressure tunnel is often accompanied with thicker rock wall, the signal of the through-the-earth communication is attenuated in the stratum and the water layer, the strength of the signal reaching the ground is greatly reduced, the electromagnetic parameters of the stratum are more changeable, and the transmission and detection technology of the weak signal is not mature. The internal water flow speed of the pressurized tunnel is high, the structure of the tunnel body is complete, and the damage to the electric wires or cables arranged on the tunnel body can cause weak points to the pressurized tunnel, so that the stability of the tunnel is not facilitated. The wireless equipment adopting the storage battery is longer in tunnel detection period, usually once a year, and cannot realize continuous observation with high precision and high strength. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a hydropower station diversion tunnel erosion damage monitoring and early warning device for solving the problems. The invention provides the following technical scheme: A hydropower station diversion tunnel erosion damage monitoring and early warning device comprises a slag collecting pool arranged in a pressurized tunnel; a rock penetrating signal emitter and a bottom plate are arranged in the slag collecting tank through a supporting spring; The rock penetrating signal receiver is arranged outside the rock body and is in wireless communication connection with the rock penetrating signal transmitter; the switch is arranged at the bottom of the bottom plate and used for triggering the rock penetrating signal transmitter. Preferably, a telescopic hydraulic rod is arranged between the bottom wall and the bottom plate in the slag collecting tank. Preferably, an adjusting cylinder is arranged at the bottom of the bottom plate and used for driving a trigger plate at the output end of the adjusting cylinder to be close to or far away from the switch. Preferably, the bottom plate bottom is provided with the liquid storage cylinder, the play liquid chamber o