Water-power engineering bottom hole maintaining and blocking structure and using method thereof

Abstract

The invention discloses a hydropower engineering bottom hole maintenance plugging structure and a using method thereof, and relates to the technical field of water conservancy and hydropower engineering hydraulic structure overhaul and maintenance. The device comprises plugging gates, a cross beam structure and a flat pressing pipe, the number of the plugging gates is two, one plugging gate is arranged at the upstream position and is an upstream plugging gate, the other plugging gate is arranged at the downstream position and is a downstream plugging gate, and the two plugging gates are connected into a whole through the connecting cross beam structure; the flat pressing pipe is of a steel pipe structure, and the two ends of the flat pressing pipe are connected with reservoir water in front of the upstream water retaining gate and water between the downstream water retaining gate and the working radial gate respectively. The two blocking gates are arranged in the tunnel and connected into a whole through the three cross beams, the walking device is used for moving the blocking structure, the water seal assembly is tightly pressed on the inner wall of the tunnel to achieve the blocking effect, the flat pressing pipe is adopted for balancing the water pressure of the upstream and the water pressure of the downstream, and finally the dry land construction condition between the two blocking gates is achieved; the plugging structure is stable, the water stopping effect is good, and construction and maintenance in the tunnel are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of inspection and maintenance of hydraulic structures of water conservancy and hydropower projects, and specifically provides a bottom hole maintenance and plugging structure for a hydropower project which has strong applicability and is convenient for plugging, and a method for using the structure. Background Art

[0002] Since the operation of the project, the flood discharge tunnel, sand flushing tunnel, emptying tunnel and other tunnels built with the project have been damaged to varying degrees after large-flow water discharge and sand flushing. In order to ensure the safety of these hydraulic structures, it is necessary to repair the damaged hydraulic structure structures. If not handled properly, the internal defects may continue to develop when the water discharge and sand flushing continue, affecting the safety of the project. Therefore, these defective hydraulic structures must be repaired. In order to provide dry construction conditions for the repair construction, it is very necessary to study scientific and reasonable blocking solutions.

[0003] Document number CN 117367696 A discloses a large-section tunnel plugging ability test device and test method using airbags, which includes airbags. According to the document, the airbag plugging method has been widely used in the plugging of small pipelines or tunnels, but there is little experience available for the plugging of large-scale tunnels at home and abroad. In the plugging of large-scale underwater tunnels, the airbag needs to overcome the huge reservoir water pressure. The increase in external pressure will inevitably require the airbag to have a higher internal pressure. There is no way to test whether the airbag material and plugging ability can achieve the plugging effect. The problems with this solution are: 1. This solution relies on the expansion of the airbag after it is filled with high-pressure gas. The outer wall of the airbag is in close contact with the inner wall of the tunnel. Under the action of the reservoir water pressure, static friction is generated between the outer wall of the airbag and the inner wall of the tunnel to resist the reservoir water pressure. 1. The inner surface of the tunnel is smooth after long-term operation, and the surface condition is difficult to grasp, and the static friction between the outer wall of the airbag and the inner wall of the tunnel is difficult to determine; 2. The tunnels of different projects are of different shapes, and the airbag device can only be set in the circular section of the blocked tunnel. The static friction between the outer wall of the airbag and the inner wall of the tunnel overcomes the water pressure. Therefore, the airbag structure needs to have sufficient length. This solution is difficult to adapt to different tunnel shapes; 3. The airbag device is huge, and the manufacturing quality and precision are difficult to guarantee. Once a leak occurs during the blocking, the tunnel will not be blocked, resulting in a major safety accident.

[0004] In water conservancy and hydropower projects, the metal structure layout of tunnels such as flood discharge tunnels, sand flushing tunnels, and emptying tunnels is mostly: an accident plane gate is arranged at the first section of the pressurized section of the tunnel, and an arc working gate is arranged at the end of the pressurized section of the tunnel. Therefore, it is possible to consider using arc gates to block water as an auxiliary measure of the blocking equipment, and use the blocking equipment to block and repair the damaged position of the tunnel. Summary of the invention

[0005] The present invention aims to solve the problem existing in the current use of airbags to plug large-section tunnels, and to provide a bottom hole maintenance plugging structure for hydropower projects with strong applicability and convenient plugging, and a method for using the structure.

[0006] The bottom hole maintenance plugging structure of the hydropower project of the present invention is arranged in the tunnel and located on both sides of the maintenance section. It is characterized in that the plugging structure includes a plugging gate, a crossbeam structure and a pressure-surge pipe. There are two plugging gates, one is arranged at the upstream position as the upstream plugging gate, and the other is arranged at the downstream as the downstream plugging gate. The two plugging gates are connected as a whole through the connecting crossbeam structure; the pressure-surge pipe is a steel pipe structure, and the two ends of the pressure-surge pipe are respectively connected to the reservoir water in front of the upstream water retaining gate and the water body between the downstream water retaining gate and the working arc gate; wherein: Two sets of water seal components are respectively arranged at the top and bottom of the blocking gate; the blocking gate is a box structure, which contains several cavities inside, including a blocking device cavity, a weighting cavity and a buoyancy cavity. The blocking device cavity is respectively arranged at the top and bottom of the blocking gate, the buoyancy cavity is arranged at the upper part of the blocking gate, and the weighting cavity is arranged at the lower part of the blocking gate; The crossbeam structure includes an upper crossbeam, a middle crossbeam and a lower crossbeam. The upper crossbeam, the middle crossbeam and the lower crossbeam are all box structures. Several buoyancy chambers are arranged inside the upper crossbeam and the middle crossbeam. Several buoyancy chambers and three walking equipment chambers are arranged inside the lower crossbeam. The three walking equipment chambers are arranged equidistantly, and buoyancy chambers are arranged between the walking equipment chambers. A walking device is arranged in the walking equipment chamber, and the walking device includes a walking wheel, an underwater motor, a reducer, a brake and a battery. The battery is placed in the walking equipment chamber, and the underwater motor is fixed at the bottom of the lower crossbeam. The underwater motor is connected to the battery through a wire. The underwater motor, the reducer and the walking wheel are connected in sequence, and the underwater motor drives the walking wheel to rotate through the reducer; the brake is installed on the walking wheel.

[0007] The equalizing pipe is also provided with a valve assembly, which includes an inspection valve and a working valve. The working valve is installed on the equalizing pipe, and the inspection valve is arranged on the equalizing pipe at the front end of the working valve. The working valve is used to open or close the channel in the equalizing pipe. After closing the inspection valve, the working valve can be inspected.

[0008] The water seal assembly includes a high-pressure gas tank, a push rod, a guide groove, a water seal base and a water seal strip. The high-pressure gas tank is placed in the middle of the equipment cavity. Two groups of guide grooves are respectively arranged on both sides of the equipment cavity. A water seal base is installed in each group of guide grooves, and the water seal base slides along the guide groove; two push rods are respectively fixed on both sides of the high-pressure gas tank, the top of the push rod is connected to the water seal base, and the push rod and the high-pressure gas tank are connected by an air pipe; the water seal strip is wrapped around the outer end of the water seal base from the inside to the outside.

[0009] The water seal base is also provided with a pressing block and a fastener, both of which are arranged on the inner wall of the outer end of the water seal base, and the water seal strip is fastened to the water seal base by the pressing block and the fastener.

[0010] Method of using the bottom hole maintenance and plugging structure in hydropower projects: (1) When the plugging structure moves in the tunnel, the push rod is retracted, the water seal assembly is retracted into the water retaining gate, the walking device is turned on, and the underwater motor drives the walking wheel to rotate through the reducer, and drives the entire plugging structure to move in the tunnel through the lower crossbeam; (2) During tunnel maintenance: (a) First close the working arc door; (b) The blocking structure moves to the position in the tunnel that requires maintenance; (c) The water seal assembly is started, the push rod extends to push the water seal base, and the water seal base extends under the guidance of the guide device and fits against the inner wall of the tunnel; (d) The high-pressure gas tank is opened to inflate the back pressure cavity of the water seal base, pressing the water seal strip against the inner wall of the tunnel to prevent water from leaking. This improves safety through at least two water seal assemblies; (e) Open the working valve on the equalizing pipe to balance the reservoir water pressure borne by the upstream blocking gate with the pressure in front of the working arc gate borne by the downstream blocking gate; (f) Draining the water between the upstream blocking gate and the downstream blocking gate will create dry land construction conditions.

[0011] The bottom hole maintenance and plugging structure of the hydropower project of the present invention is scientifically designed and easy to use. Two plugging gates are arranged in the tunnel and connected as a whole by three cross beams. The plugging structure is moved by a walking device, and the water seal component is pressed against the inner wall of the tunnel to achieve the plugging effect. A pressure-equalizing pipe is used to balance the water pressure between the upstream and downstream, and finally dry land construction conditions are achieved between the two plugging gates. During the construction process, the plugging structure is stable and has a good water-stopping effect, which is convenient for construction and maintenance in the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention.

[0013] Figure 2 It is a schematic diagram of the water seal component structure.

[0014] Figure 3 This is a schematic diagram of the walking device structure.

[0015] Figure 4 This is a schematic diagram of the blocking state.

[0016] Among them, there are tunnel 1, blocking gate 2, equalizing pipe 3, blocking equipment cavity 4, weighting cavity 5, buoyancy cavity 6, maintenance valve 7, working valve 8, high-pressure gas tank 9, push rod 10, guide groove 11, water seal base 12, water seal strip 13, pressure block 14, fastener 15, upper crossbeam 16, middle crossbeam 17, lower crossbeam 18, walking equipment cavity 19, walking wheel 20, underwater motor 21, reducer 22, and battery 23. DETAILED DESCRIPTION

[0017] Embodiment 1: A bottom hole maintenance plugging structure for a hydropower project is arranged in a tunnel and located on both sides of a maintenance section. The plugging structure includes a plugging gate, a crossbeam structure and a pressure-surge pipe. There are two plugging gates, one arranged at an upstream position as an upstream plugging gate, and the other arranged at a downstream position as a downstream plugging gate. The two plugging gates are connected as a whole by a connecting crossbeam structure; the pressure-surge pipe is a steel pipe structure, and the two ends of the pressure-surge pipe are respectively connected to the reservoir water in front of the upstream water retaining gate and the water body between the downstream water retaining gate and the working arc gate; wherein: Two sets of water seal components are respectively arranged at the top and bottom of the blocking gate; the blocking gate is a box structure, which contains several cavities inside, including a blocking device cavity, a weighting cavity and a buoyancy cavity. The blocking device cavity is respectively arranged at the top and bottom of the blocking gate, the buoyancy cavity is arranged at the upper part of the blocking gate, and the weighting cavity is arranged at the lower part of the blocking gate; The crossbeam structure includes an upper crossbeam, a middle crossbeam and a lower crossbeam. The upper crossbeam, the middle crossbeam and the lower crossbeam are all box structures. Several buoyancy chambers are arranged inside the upper crossbeam and the middle crossbeam. Several buoyancy chambers and three walking equipment chambers are arranged inside the lower crossbeam. The three walking equipment chambers are arranged equidistantly, and buoyancy chambers are arranged between the walking equipment chambers. A walking device is arranged in the walking equipment chamber, and the walking device includes a walking wheel, an underwater motor, a reducer, a brake and a battery. The battery is placed in the walking equipment chamber, and the underwater motor is fixed at the bottom of the lower crossbeam. The underwater motor is connected to the battery through a wire. The underwater motor, the reducer and the walking wheel are connected in sequence, and the underwater motor drives the walking wheel to rotate through the reducer; the brake is installed on the walking wheel.

[0018] A valve assembly is also provided on the equalizing pressure pipe, and the valve assembly includes an inspection valve and a working valve. The working valve is installed on the equalizing pressure pipe, and the inspection valve is arranged on the equalizing pressure pipe at the front end of the working valve. The working valve is used to open or close the channel in the equalizing pressure pipe. After closing the inspection valve, the working valve can be inspected.

[0019] The water seal assembly includes a high-pressure gas tank with a pressure of not less than 2Mpa, a push rod, a guide groove, a water seal base and a water seal strip. The high-pressure gas tank is placed in the middle of the equipment cavity. Two groups of guide grooves are respectively arranged on both sides of the equipment cavity. A water seal base is installed in each group of guide grooves, and the water seal base slides along the guide groove; two push rods are respectively fixed on both sides of the high-pressure gas tank, the top of the push rod is connected to the water seal base, and the push rod and the high-pressure gas tank are connected by an air pipe; the water seal strip is wrapped around the outer end of the water seal base from the inside to the outside.

[0020] The water seal base is also provided with a pressing block and a fastener, both of which are arranged on the inner wall of the outer end of the water seal base, and the water seal strip is fastened to the water seal base by the pressing block and the fastener.

[0021] Method of using the bottom hole maintenance and plugging structure in hydropower projects: (1) When the plugging structure moves in the tunnel, the push rod is retracted, the water seal assembly is retracted into the water retaining gate, the walking device is turned on, and the underwater motor drives the walking wheel to rotate through the reducer, and drives the entire plugging structure to move in the tunnel through the lower crossbeam; (2) During tunnel maintenance: (a) First close the working arc door; (b) The blocking structure moves to the position in the tunnel that requires maintenance; (c) The water seal assembly is started, the push rod extends to push the water seal base, and the water seal base extends under the guidance of the guide device and fits against the inner wall of the tunnel; (d) The high-pressure gas tank is opened to inflate the back pressure cavity of the water seal base, pressing the water seal strip against the inner wall of the tunnel to prevent water from leaking. This improves safety through at least two water seal assemblies; (e) Open the working valve on the equalizing pipe to balance the reservoir water pressure borne by the upstream blocking gate with the pressure in front of the working arc gate borne by the downstream blocking gate; (f) Draining the water between the upstream blocking gate and the downstream blocking gate will create dry land construction conditions.

Claims

1. A bottom hole maintenance and plugging structure for a hydropower project, arranged in a tunnel, located on both sides of the maintenance section, characterized in that The blocking structure includes a blocking gate, a crossbeam structure and a pressure-surge pipe. There are two blocking gates, one of which is located at the upstream position and is the upstream blocking gate, and the other is located at the downstream position and is the downstream blocking gate. The two blocking gates are connected as a whole through a connecting crossbeam structure; the pressure-surge pipe is a steel pipe structure, and the two ends of the pressure-surge pipe are respectively connected to the reservoir water in front of the upstream water retaining gate and the water body between the downstream water retaining gate and the working arc gate; wherein: Two sets of water seal components are respectively arranged at the top and bottom of the blocking gate; the blocking gate is a box structure, which contains several cavities inside, and the cavity includes a blocking equipment cavity, a weighting cavity and a buoyancy cavity. The blocking equipment cavity is respectively arranged at the top and bottom of the blocking gate, the buoyancy cavity is arranged at the upper part of the blocking gate, and the weighting cavity is arranged at the lower part of the blocking gate; the water seal component includes a high-pressure gas tank, a push rod, a guide groove, a water seal base and a water seal strip, the high-pressure gas tank is placed in the middle of the equipment cavity, two groups of guide grooves are respectively arranged on both sides of the equipment cavity, a water seal base is installed in each group of guide grooves, and the water seal base slides along the guide groove; two push rods are respectively fixed on both sides of the high-pressure gas tank, the top of the push rod is connected to the water seal base, and the push rod and the high-pressure gas tank are connected by an air pipe; the water seal strip is wrapped around the outer end of the water seal base from the inside to the outside; The crossbeam structure includes an upper crossbeam, a middle crossbeam and a lower crossbeam. The upper crossbeam, the middle crossbeam and the lower crossbeam are all box structures. Several buoyancy chambers are arranged inside the upper crossbeam and the middle crossbeam. Several buoyancy chambers and three walking equipment chambers are arranged inside the lower crossbeam. The three walking equipment chambers are arranged equidistantly, and buoyancy chambers are arranged between the walking equipment chambers. A walking device is arranged in the walking equipment chamber, and the walking device includes a walking wheel, an underwater motor, a reducer, a brake and a battery. The battery is placed in the walking equipment chamber, and the underwater motor is fixed at the bottom of the lower crossbeam. The underwater motor is connected to the battery through a wire. The underwater motor, the reducer and the walking wheel are connected in sequence, and the underwater motor drives the walking wheel to rotate through the reducer; the brake is installed on the walking wheel.

2. The bottom hole maintenance and plugging structure for a hydropower project as claimed in claim 1, characterized in that The equalizing pipe is also provided with a valve assembly, which includes an inspection valve and a working valve. The working valve is installed on the equalizing pipe, and the inspection valve is arranged on the equalizing pipe at the front end of the working valve.

3. The bottom hole maintenance and plugging structure for hydropower engineering according to claim 1, characterized in that The water seal base is also provided with a pressing block and a fastener, both of which are arranged on the inner wall of the outer end of the water seal base, and the water seal strip is fastened to the water seal base by the pressing block and the fastener.

4. The bottom hole maintenance and plugging structure for hydropower engineering according to claim 1, characterized in that How to use the blocking structure: (1) When the plugging structure moves in the tunnel, the push rod is retracted, the water seal assembly is retracted into the water retaining gate, the walking device is turned on, and the underwater motor drives the walking wheel to rotate through the reducer, and drives the entire plugging structure to move in the tunnel through the lower crossbeam; (2) During tunnel maintenance: (a) First close the working arc door; (b) The blocking structure moves to the position in the tunnel that requires maintenance; (c) The water seal assembly is started, the push rod extends to push the water seal base, and the water seal base extends under the guidance of the guide device and fits against the inner wall of the tunnel; (d) The high-pressure gas tank is opened to inflate the back pressure cavity of the water seal base, pressing the water seal strip against the inner wall of the tunnel to prevent water from leaking. This improves safety through at least two water seal assemblies; (e) Open the working valve on the equalizing pipe to balance the reservoir water pressure borne by the upstream blocking gate with the pressure in front of the working arc gate borne by the downstream blocking gate; (f) Draining the water between the upstream blocking gate and the downstream blocking gate will create dry land construction conditions.

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