Automatic monitoring device for settlement of dam back slope of concrete face rockfill dam

Abstract

The utility model relates to the technical field of hydropower station operation and maintenance, in particular to an automatic monitoring device for settlement of a back slope of a concrete face rockfill dam, and aims to solve the problems that in the process of monitoring the settlement of the back slope of the concrete face rockfill dam at present, the existing monitoring mode is time-consuming and labor-consuming and low in measurement precision; and the safety management of the dam body of the power station is limited. According to the device, an open base point bowl body and a measuring point bowl body are connected through a communicating pipe to form a communicating liquid level static force level, then the base point bowl body, the measuring point bowl body and the communicating pipe are filled with anti-freezing liquid, and when the anti-freezing liquid in the base point bowl body is in an overflow consistent reference state all the time, the change of a graduated scale at the measuring point bowl body is observed; the zero point of the graduated scale and the zero position of the pressure sensor are adjusted to be the same elevation, then the measurement and control unit module in the observation room collects and calculates the data of the liquid level change of the bowl body at the measurement point, the settlement variation of the measurement point relative to the base point can be obtained, and the convenience, safety and precision of dam back slope settlement monitoring are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydropower station operation and maintenance, and particularly relates to a concrete face rockfill dam back slope settlement automatic monitoring device. BACKGROUND

[0002] At present, in the daily operation and maintenance process of the hydropower station, the settlement of the face rockfill dam back slope plays a crucial role in the safe operation of the whole dam of the hydropower station, therefore, a plurality of observation rooms need to be arranged on the back slope, and a tensioned wire displacement meter and a water pipe type settlement gauge are arranged in the observation rooms for periodically monitoring the horizontal displacement and vertical displacement inside the dam body. However, the commonly used displacement monitoring method is to arrange a leveling route outside the observation room for measuring the settlement of the observation room, and an artificial leveling measurement process is adopted, and the leveling measurement data of the observation room is mainly used to calculate the absolute displacement of the measured value of the water pipe settlement gauge inside the dam body, so as to obtain the absolute settlement value inside the dam body. However, this kind of monitoring and measurement method of the back slope settlement is limited by the back slope and the terrain on both sides, and the artificial leveling measurement cannot meet the requirements of the "National Third and Fourth Leveling Measurement Specification" in terms of measurement distance and front and back sight distance, which obviously leads to low measurement accuracy, and the instrument erection and staff conditions are poor, so that the measurement process has a high safety risk, and the artificial measurement frequency is low, and the matching degree with the automatic measurement frequency of the water pipe settlement gauge is low, which cannot meet the emergency measurement requirements in special working conditions such as earthquakes, therefore, it is necessary to improve the measurement method of the vertical displacement of the back observation room to realize safe, efficient and convenient automatic vertical displacement measurement. CONTENT OF THE UTILITY MODEL

[0003] The utility model provides a concrete face rockfill dam back slope settlement automatic monitoring device to solve the problems in the above background.

[0004] In order to realize the above purpose, the utility model adopts the following technical scheme:

[0005] A concrete face rockfill dam back slope settlement automatic monitoring device, comprising an open base point pot body arranged at a stable rock on the back slope, a communication pipe connected to the bottom of the base point pot body, a plurality of open measurement point pot bodies arranged in the observation room and connected in series to the communication pipe, a scale fixedly connected to the side wall of the measurement point pot body, a liquid supplement pipe communicated with the bottom of the measurement point pot body, the liquid supplement pipe being connected to a liquid storage tank, a pressure sensor arranged on the side of the liquid supplement pipe close to the bottom of the measurement point pot body, an electromagnetic valve arranged on the liquid supplement pipe between the pressure sensor and the liquid storage tank, the electromagnetic valve and the pressure sensor being connected to a measurement and control unit, and antifreeze being arranged in the base point pot body, the communication pipe, the measurement point pot body, the liquid supplement pipe and the liquid storage tank.

[0006] Further, the top of the base point pot is fixed with an open overflow, the top of the overflow is fixed with a protective cover, and the side of the protective cover is provided with an observation window, and the bottom of the base point pot is fixedly connected to the mounting base.

[0007] Further, the observation room is fixedly provided with mounting brackets, and the measuring point pots are fixedly connected with the mounting brackets.

[0008] Further, the base point pot is selected from UPVC hard pipe, the outer diameter is 50mm, the wall thickness is 5mm, the communication pipe is selected from nylon pipe, the outer diameter is 16mm, the wall thickness is 2mm, the protective cover is selected from stainless steel material, the plate thickness is 1mm, and the anti-freezing liquid is selected from-25℃.

[0009] The utility model has the following beneficial effects:

[0010] The utility model provides a kind of concrete face rockfill dam rear slope settlement automatic monitoring device, by adopting open base point pot and measuring point pot in the communication pipe connection under constitute communication liquid level static level, then fill anti-freezing liquid in base point, measuring point pot and communication pipe, in the anti-freezing liquid of base point pot is always in the consistent reference state of overflow, the change of observing measuring point pot scale, ensure that scale zero point and pressure sensor zero position adjustment are same elevation, after again the data acquisition calculation of measuring point pot liquid level change in observation room measuring and control unit module, the settlement variation of measuring point relative to base point can be obtained, and then effectively improve the convenience, security and precision of dam rear slope settlement monitoring, solve the problem that power station dam body safety management is limited due to the time-consuming and laborious and the measurement accuracy of existing monitoring mode is low in the settlement monitoring process of concrete face rockfill dam rear slope.

[0011] The utility model base point pot and measuring point pot are all open design, and base point pot is overflow structure, effectively simplifies and cancels the measurement of reference point liquid level height, eliminates the influence of liquid evaporation and leakage on the accuracy of measured value, and simultaneously, liquid level height uses non-mechanical liquid level measurement mode, i.e. ceramic pressure sensor is installed at the bottom of measuring point liquid level pot, and liquid level pressure change is converted into liquid level height change, which can be directly used for settlement calculation.

[0012] The utility model has automatic real-time monitoring and measuring function, realizes linkage measurement with dam water pipe type settlement meter, greatly meets the need of dam internal absolute vertical displacement calculation, and provides timely and accurate monitoring information for judging the safety and stability of dam engineering structure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is overall structure schematic diagram of the utility model.

[0014] The meanings of the reference signs are as follows:

[0015] 1, base point pot; 2, overflow; 3, protective cover; 4, observation window; 5, anti-freezing liquid; 6, mounting base; 7, communication pipe; 8, measuring point pot; 9, scale; 10, liquid supplement pipe; 11, liquid storage tank; 12, electromagnetic valve; 13, pressure sensor; 14, measurement and control unit; 15, mounting bracket; 16, horizontal liquid level line; 17, observation room. DETAILED DESCRIPTION

[0016] The utility model will be further described in connection with the drawings and specific embodiments.

[0017] As Figure 1 shown, a concrete face rockfill dam back slope settlement automatic monitoring device, including the open base point pot 1 that sets in the dam back slope, the bottom of base point pot 1 is connected with communication pipe 7, communication pipe 7 is connected to a plurality of open measuring point pot 8 that sets in observation room 17, the lateral wall of measuring point pot 8 is fixedly connected with scale 9, the bottom of measuring point pot 8 is communicated with liquid supplement pipe 10, liquid supplement pipe 10 is connected to liquid storage tank 11, and one side of liquid supplement pipe 10 close to the bottom of measuring point pot 8 is equipped with pressure sensor 13, and electromagnetic valve 12 is equipped on liquid supplement pipe 10 between pressure sensor 13 and liquid storage tank 11, and electromagnetic valve 12 and pressure sensor 13 are all connected to measurement and control unit 14, and the inside of base point pot 1, communication pipe 7, measuring point pot 8, liquid supplement pipe 10 and liquid storage tank 11 is all filled with anti-freezing liquid 5.

[0018] The top of base point pot 1 is fixedly provided with open overflow 2, the top of overflow 2 is fixedly provided with protective cover 3, and the side of protective cover 3 is provided with observation window 4, and the bottom of base point pot 1 is fixedly connected to mounting base 6.

[0019] The inside of observation room 17 is all fixedly provided with mounting bracket 15, and the measuring point pot 8 is all fixedly connected with mounting bracket 15.

[0020] In the specific application, the device components are installed well in advance according to the drawing, the existing liquid storage tank 11 in each observation room 17 is increased with pipeline, the measuring point pot 8 is connected, the electromagnetic valve 12 is controlled, the static water level pipe water adding needs are met, the pressure sensor 13 and electromagnetic valve 12 are connected to the automatic measurement and control unit 14 module of the existing water pipe type settlement instrument in observation room 17, corresponding parameters are configured on data acquisition management software, and the opening and closing of electromagnetic valve 12 and the data acquisition related functions of pressure sensor 13 are controlled.

[0021] After the installation of the device is completed, the communication pipe 7 is not connected with the base point pot body 1, the water pump is connected with the communication pipe 7 at the reference point position, the whole system is supplemented with water or antifreeze liquid 5, so as to empty the air in the pipeline, until there is no bubble in each measuring point pot body 8, the liquid level reaches the full range, the communication pipe 7 is quickly connected with the base point pot body 1, after the liquid surface in the measuring point pot body 8 and the base point pot body 1 is stable, the water or antifreeze liquid 5 is continuously added to the base point pot body 1 until the liquid in the base point pot body 1 overflows, at this time the whole system has a working state.

[0022] First, open the electromagnetic valve 12 on each measuring point liquid supplement pipe 10, supplement water or antifreeze liquid 5 to the measuring point pot body 8, the liquid supplement time is 6 seconds, since the base point pot body 1 is designed as an open overflow, and the pipe opening elevation of the base point pot body 1 is much lower than that of each measuring point pot body 8, at this time the newly supplemented water or antifreeze liquid 5 of each measuring point will flow to the base point, and the excess water or antifreeze liquid 5 will overflow from the base point pot body 1, finally the liquid surface of each measuring point and the base point (the base point liquid surface is the pipe opening elevation of the base point pot body 1) will be kept at the same horizontal plane, that is, the horizontal liquid level line 16, after the liquid surface is stable, the pressure sensor 13 installed on the bottom side of the measuring point is started, the liquid level height in each measuring point pot body 8 is measured, that is, a single measurement is completed, further, if settlement occurs in a certain measuring point pot body 8, it will cause the amount of water or antifreeze liquid 5 in the whole system to decrease, the liquid level of the measuring point and the base point will be lower than the pipe opening elevation of the base point, through liquid supplement, the liquid surface in each measuring point pipe and the base point liquid surface can reach the pipe opening elevation of the base point again, at this time the liquid level height in the measuring point pipe where settlement occurs will be greater than the previous liquid level height, the above steps are repeated, the liquid level height data of each measuring point at two times is obtained, the difference between the two data is the settlement change of the measuring point, the whole monitoring and measuring process effectively improves the convenience, safety and precision of the slope settlement monitoring behind the concrete face rockfill dam, therefore, the device has good practicality.

Claims

1. An automatic monitoring device for settlement of the downstream slope of a concrete-faced rockfill dam, characterized in that: The system includes an open base point basin (1) set on the back slope of the dam. The bottom of the base point basin (1) is connected to a connecting pipe (7). The connecting pipe (7) is connected in series to multiple open measuring point basins (8) set in the observation room (17). A scale (9) is fixedly connected to the side wall of the measuring point basin (8). The bottom of the measuring point basin (8) is connected to a liquid replenishment pipe (10). The liquid replenishment pipe (10) is connected to a liquid storage tank (11). A pressure sensor (13) is provided on the side of the liquid replenishment pipe (10) near the bottom of the measuring point basin (8). A solenoid valve (12) is provided on the liquid replenishment pipe (10) between the pressure sensor (13) and the liquid storage tank (11). The solenoid valve (12) and the pressure sensor (13) are both connected to the measurement and control unit (14). Antifreeze (5) is filled in the base point basin (1), the connecting pipe (7), the measuring point basin (8), the liquid replenishment pipe (10) and the liquid storage tank (11).

2. The automatic monitoring device for settlement of the downstream slope of a concrete-faced rockfill dam according to claim 1, characterized in that: The base bowl (1) is fixedly provided with an open overflow port (2) at the top, and a protective cover (3) is fixedly provided at the top of the overflow port (2). The protective cover (3) is provided with an observation window (4) on the side. The bottom of the base bowl (1) is fixedly connected to the mounting base (6).

3. The automatic monitoring device for settlement of the downstream slope of a concrete-faced rockfill dam according to claim 1, characterized in that: Each observation room (17) is equipped with a fixed mounting bracket (15), and each measuring point basin (8) is fixedly connected to the mounting bracket (15).

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