WO2019192265A1

WO2019192265A1 - Flow rate sensing-based underwater dam leakage detection system

Info

Publication number: WO2019192265A1
Application number: PCT/CN2019/074983
Authority: WO
Inventors: 武颖利; 杨胜; 易瑞吉; 郭万里; 何宁; 李登华; 肖立敏; 凌华; 王芳; 张兆省; 皇甫泽华; 范红霞; 任强; 黄英豪; 傅华; 龚丽飞; 李勇; 李士林; 胡哲; 张举华
Original assignee: 水利部交通运输部国家能源局南京水利科学研究院; 国电科学技术研究院有限公司成都分公司
Priority date: 2018-04-04
Filing date: 2019-02-13
Publication date: 2019-10-10
Also published as: CN109781354B; CN109781354A

Abstract

A flow rate sensing-based underwater dam leakage detection system, comprising a moving platform, a pressure sensing device (2), a traction device and a positioning device (5); the pressure sensing device (2) and the positioning device (5) are disposed on the moving platform, and the traction device controls the moving platform to move on a surface of a concrete panel of a dam; the pressure sensing device (2) senses changes in pressure caused by water flow, and transmits the location of a leakage point by means of the positioning device (5). The detection system enables the rapid, efficient and low-cost detection of underwater leakage from concrete panels and rock-fill dam panels.

Description

Dam leakage detection system based on flow velocity induction

Technical field

The invention relates to the field of detecting equipment, in particular to a dam body leakage detecting system based on flow velocity sensing. This patent is completed by the National Key R&D Program “Research on Key Technologies for Risk Management of Plain Reservoir Projects” (2017YFC0405005).

Background technique

As the main dam type, concrete face rockfill dam is widely used in water conservancy and hydropower projects. Concrete slabs are an important part of dam body anti-seepage system, and its safety directly determines the safety of dam body. Influenced by the construction quality of the dam body, seismic load, etc., the anti-seepage panel of the concrete face rockfill dam and the panel joints and the surrounding joints are prone to local damage leading to leakage. If not treated in time, it will lead to the back cushion and the transition layer in the panel. The fine particulate material is carried away by the permeated water, which causes the working state of the panel to further deteriorate, which will cause the dam to collapse and cause irreparable damage.

For the leakage of concrete slabs, it occurs below the water level line. It is difficult to detect the leakage points. The most effective method is the isotope tracing method. This method has certain pollution to the water body because of the radioisotope used. The conventional method is to vent the reservoir, expose the panel, and perform manual inspection. This method is also very effective, but it will lead to huge waste of water resources and huge economic losses. Therefore, it is particularly important to find a simple and efficient means of underwater leakage detection.

Summary of the invention

It is an object of the present invention to provide a simple and efficient dam leakage detection system. Realize underwater leakage detection of concrete face rockfill dam.

To achieve the above technical purpose, the present invention adopts the following technical solutions:

A dam body leakage underwater detecting system based on flow velocity sensing, comprising a moving platform, a pressure sensing device, a traction device and a positioning device; the flow velocity sensing device and the positioning device are arranged on a mobile platform, and the traction device controls the mobile platform Moving on the surface of the dam concrete panel; the flow sensing device senses a pressure change caused by the water flow, and transmits the position of the leak point through the positioning device.

As a further improvement of the present invention, the flow rate sensing device is an upper and lower permeating device, and the edge of the bottom of the pressure sensing device is made of a flexible rubber material; and a pressure sensing film or a propeller is disposed at an upper opening of the pressure sensing device. The edge of the bottom of the flow sensing device is made of a flexible rubber material, so that the lower part of the pressure sensing device and the dam body are fully fitted to close the opening of the lower portion of the flow rate sensing device. The flow sensing device detects leakage by sensing pressure changes caused by water flow. The sensor may be a pressure sensing film or a propeller. The pressure sensing film disposed in the flow velocity sensing device is disposed at an upper cross-sectional position to ensure free flow of water. When the cleaning device is subsequently disposed, the pressure nozzle can be easily injected into the pressure sensing device through water injection. Displacement of turbid water; smaller upper section design can also ensure good transparency of the water after replacement, and reduce the exchange of clean water and turbid water after replacement. The propeller is used for pressure detection, and the propeller can be rotated by the water flow to sense the change of the water flow, thereby determining whether the dam body has leakage, and determining the leakage speed of the dam by establishing the relationship between the propeller speed and the fluid velocity. Preferably, the pressure sensing film is used for pressure detection. When there is no leakage of the panel, the pressure sensing device has no water flowing at the upper and lower ends. At this time, the pressure sensing film has no pressure signal, and when the moving platform walks to the leakage point, the pressure sensing device A body fluid is present inside, and the pressure sensing membrane senses a change in pressure to determine the location of the leak.

As a further improvement of the present invention, the lower portion of the flow velocity sensing device has a rectangular cross section, the width of the rectangular cross section is 1/3 of the panel width, and the upper opening is a circular cross section; the rectangular cross sectional area is much larger than the circular cross sectional area. The cross-sectional area of the lower opening of the flow sensing device is much larger than the cross-sectional area at the upper opening, and sensitive detection is achieved for the small leakage of the dam.

As a further improvement of the present invention, the guide rail is further included; the guide rail is vertically fixed to the moving platform; and the flow velocity sensing device is connected to the guide rail through the connecting rod to slide in the direction of the guide rail. When the guide rail is set, when the flow velocity sensing device senses the pressure change, the control pressure sensing device moves downward along the guide rail, so that the bottom edge of the flexible rubber at the bottom of the flow velocity sensing device is pressed against the panel surface, and the lower end of the flow velocity sensing device is closed. The pressure value of the pressure sensitive membrane can further determine the leak rate.

As a further improvement of the present invention, a high pressure cleaning device is provided, which is disposed inside the pressure sensing device, and includes a pressure nozzle, a pressure head travel rail and a driving device. Driven by the driving device, the pressure nozzle moves along the traveling rail, cleans the panel and discharges the turbid water inside the pressure sensing device. Further, an imaging device is further included, which is mounted on the side of the pressure nozzle, and includes a camera and a lighting device. After the turbid water body is replaced, the driving device drives the camera device to walk along the traveling rail, and performs real-time imaging on the dam surface to obtain the image of the dam surface of the leakage point. The acquired image can be transmitted to the control host through wireless communication to form a specific position distribution graphic information of the underwater leakage point of the panel.

As a further improvement of the present invention, the mobile platform is composed of a driving device, a crawler belt, a driving wheel, a driven wheel and a device carrier; the equipment carrier is disposed on the crawler belt, and the driving device controls the driven wheel and the driving wheel to rotate to drive the track to rotate. Mobile devices.

As a further improvement of the present invention, the traction device comprises a hoisting machine and a traction cable; the traction cable is connected to the moving platform, and the reciprocating motion of the device along the dam surface is jointly controlled by the driving force of the moving platform and the traction of the hoisting machine.

As a further improvement of the present invention, an electromagnet is provided at the bottom of the mobile platform. During the walking process, the electromagnet is magnetized by the input current, and the steel bars inside the reinforced concrete are adsorbed, so that the device can be better adsorbed on the panel; at the same time, such a design can realize the vertical façade of the concrete gravity dam and the arch dam Leakage detection of the chamfered surface greatly enhances the application surface of the device.

As a further improvement of the present invention, a plurality of high-pressure cleaning nozzles may be disposed at the front end of the mobile platform to perform preliminary cleaning of deposits on the surface of the dam body to ensure normal walking of the equipment;

The system of the invention realizes the rapid and efficient low-cost detection of underwater leakage of the concrete face rockfill dam panel by the movement of the mobile platform and the pressure sensing of the flow velocity sensing device. In addition, underwater high-pressure cleaning device and underwater camera device can be combined to collect images of specific features of the underwater leakage point of the panel.

DRAWINGS

Figure 1 is a schematic view showing the structure of the device of the present invention;

Among them, 1. pressure sensing film, 2. pressure sensing device, 3. connecting rod, 4. rail, 5. positioning device, 6. equipment carrier, 7. driving wheel, 8. driven wheel, 9. crawler, 10. Sensor attitude control motor, 11. winch, 12. traction cable, 13. flexible rubber bottom, 14. slide joint, 15. pressure nozzle travel guide, 16. pressure nozzle, 17. hydraulic pump, 18. high pressure Water flexible pipe.

detailed description

The technical solutions of the present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

Example 1

The system shown in Figure 1, comprising a mobile platform, a pressure sensing device 2, a traction device, a guide rail 4 and a positioning device 5;

The moving platform is composed of a driving device, a crawler belt 9, a driving wheel 7, a driven wheel 8, and a equipment platform 6; the equipment platform 6 is disposed on the crawler belt 9.

The flow rate sensing device 2 and the positioning device 5 are disposed on the equipment stage 6; the guide rail 4 is vertically fixed to the equipment stage 6; and the flow rate sensing device 2 is connected to the guide rail 4 via the connecting rod 3 to slide in the direction of the guide rail 4. The flow velocity sensing device 2 is an upper and lower permeating device, and the edge of the bottom of the flow velocity sensing device 2 is a flexible rubber material 13; and the pressure sensing film 1 is disposed at an upper opening of the flow velocity sensing device 2. The lower opening of the flow velocity sensing device 2 has a rectangular cross section. According to the width of the panel in the actual project, the width of the rectangular section is 1/3 of the panel width, and the length direction is 2 m; the upper opening is a circular section, and the circular opening diameter is 20cm, so that the rectangular cross-sectional area is much larger than the circular cross-sectional area.

The traction device comprises a hoisting machine 11 and a traction cable 12; the traction cable 12 is connected to the moving platform, and the driving force of the moving platform and the traction of the hoisting machine 11 jointly control the reciprocating motion of the device along the dam surface.

The hoisting machine 11 is fixed on one side of the dam top panel, the system equipment is placed on the panel, and the traction cable 12 is released by the hoisting machine 11, and moves downward along the panel into the water body under the self-weight of the system equipment, and the bottom of the flow velocity sensing device 2 is There is a small gap on the surface of the panel. When there is no leakage in the panel, there is no water flow on the upper and lower ends of the pressure sensing device 2. At this time, the pressure sensing film 1 has no pressure signal. When the device walks to the leakage point, the inside of the pressure sensing device 2 When the water body fluid appears, the pressure sensing film 1 will sense the pressure change. At this time, the hoisting machine 11 is closed to make the device stand still, and the flow rate sensing device 2 controls the flow rate sensing device 2 to move downward along the control rail 4, so that the flow rate sensing device 2 The bottom flexible rubber bottom edge 13 of the outer casing 2 is pressed against the surface of the panel, and the lower end of the flow velocity sensing device 2 is closed. The pressure value of the pressure sensing membrane 1 is used to determine the leakage speed, and the leakage is detected by the positioning device 5. The point coordinate position is recorded and transmitted to facilitate subsequent repairs.

Example 2

The present embodiment differs from the first embodiment only in that it further includes a high pressure cleaning device and an imaging device. The high pressure cleaning device is disposed inside the flow velocity sensing device 2, and includes a pressure nozzle 16, a pressure nozzle traveling rail 15, and a driving device. The camera device is mounted on the side of the pressure head 16, including a camera and a lighting device.

The hoisting machine 11 is fixed on one side of the dam top panel, the system equipment is placed on the panel, and the traction cable 12 is released by the hoisting machine 11, and moves downward along the panel into the water body under the self-weight of the system equipment, and the bottom of the flow velocity sensing device 2 is There is a small gap on the surface of the panel. When there is no leakage in the panel, the flow sensing device 2 has no water flowing at the upper and lower ends. At this time, the pressure sensing film 1 has no pressure signal. When the device walks to the leaking point, the flow sensing device 2 is inside. When the water body fluid appears, the pressure sensing film 1 will sense the pressure change. At this time, the hoisting machine 11 is closed to make the device stand still, and the flow rate sensing device 2 controls the flow rate sensing device 2 to move downward along the control rail 4, so that the flow rate sensing device 2 The bottom flexible rubber bottom edge 13 of the outer casing 2 is pressed against the surface of the panel, and the lower end of the flow velocity sensing device 2 is closed. The pressure value of the pressure sensing membrane 1 is used to determine the leakage speed here, and the pressure nozzle 16 is disposed at the same time. Control the motor, control the pressure nozzle 16 to walk along the pressure nozzle travel rail 15, while opening the hydraulic pump 17, will be clean The pressurized water body is sprayed to the panel surface through the high-pressure water flexible pipe 18 and the pressure spray head 16, the deposit attached to the panel is cleaned, and the turbid water is displaced out of the flow velocity sensing device 2, so that the water body inside the flow velocity sensing device 2 is very good. Transparency, at this time combined with the high-definition underwater camera and lighting device placed on the pressure nozzle 16, the surface leakage of the panel is photographed, and the signal is transmitted to the receiving end through the signal cable to complete the detection and recording of the leakage of the panel surface. At the same time, the positioning position of the leakage point is recorded and transmitted by the positioning device 5, which facilitates subsequent repair.

Example 3

The difference between this embodiment and the first embodiment is that the propeller is disposed at the cross-sectional position of the pressure sensing device, and the propeller is rotated by the water flow to sense the change of the water flow, thereby determining whether the dam body leaks, and establishing the propeller rotation speed. Relationship with fluid velocity to determine the leakage rate of the dam.

The above is a preferred embodiment of the present invention, and is not intended to limit the invention. For those skilled in the art, the technical solutions of the foregoing functional components may be modified or equivalent to some of the technical features. It is to be understood that any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

A dam body leakage underwater detecting system based on flow velocity sensing, characterized in that it comprises a moving platform, a pressure sensing device, a traction device and a positioning device;

The flow rate sensing device and the positioning device are disposed on a moving platform, and the traction device controls the moving platform to move on the surface of the concrete surface of the dam; the flow sensing device senses a pressure change caused by the water flow, and transmits the position of the leakage point through the positioning device.
The dam body leakage detecting system based on flow rate sensing according to claim 1, wherein the flow rate sensing device is a top and bottom permeable device, and the bottom of the pressure sensing device is made of a flexible rubber material; the upper part of the pressure sensing device A pressure sensing film or a propeller is provided at the opening; a pressure sensing film is preferred.
The dam body leakage detecting system based on flow velocity sensing according to claim 1, wherein the lower portion of the pressure sensing device has a rectangular cross section, and the width of the rectangular section is 1/3 of the panel width; A circular cross section; the rectangular cross-sectional area is much larger than the circular cross-sectional area.
The dam body leakage detecting system based on flow rate sensing according to claim 2, further comprising a guide rail; the guide rail is vertically fixed to the moving platform; and the pressure sensing device is connected to the guide rail through the connecting rod, along the guide rail direction slide.
The dam body leakage detecting system based on flow rate sensing according to claim 1 or 3, further comprising a high pressure cleaning device disposed inside the pressure sensing device, including a pressure nozzle and a pressure nozzle Walking rails and drive units.
The dam body leakage detecting system based on flow velocity sensing according to claim 5, further comprising an imaging device mounted on a side of the pressure nozzle, including a camera and a lighting device.
The dam body leakage detecting system based on flow velocity sensing according to claim 1, wherein the moving platform is composed of a driving device, a crawler belt, a driving wheel, a driven wheel and a device carrier; On the crawler, the driving device controls the driven wheel and the driving wheel to rotate to drive the track to move the device.
The dam body leakage detecting system based on flow velocity sensing according to claim 1, wherein the traction device comprises a hoist and a traction cable; the traction cable is connected to the mobile platform and driven by the mobile platform itself. The traction of the force and the winch jointly controls the reciprocating motion of the equipment along the dam surface.
The dam body leakage detecting system based on flow velocity sensing according to claim 1, wherein an electromagnet is disposed at the bottom of the moving platform.
The dam body leakage detecting system based on flow rate sensing according to claim 1, wherein the front end of the moving platform is provided with a high pressure cleaning nozzle.