Water-power engineering bottom hole maintenance blocking gate

Abstract

The utility model discloses a hydropower engineering bottom hole maintenance blocking gate and relates to the technical field of water conservancy and hydropower engineering hydraulic structure overhaul and maintenance. The blocking gate is arranged in a tunnel and located on the two sides of a maintenance section, the number of the blocking gate is two, one blocking gate is arranged at the upstream position and serves as an upstream blocking gate, the other blocking gate is arranged at the downstream position and serves as a downstream blocking gate, and the two blocking gates are connected into a whole through a connecting cross beam. The flat pressing pipe is of a steel pipe structure and is connected with reservoir water at the front part of the upstream water retaining gate and a water body between the downstream water retaining gate and the working radial gate; the valve assembly is installed on the flat pressing pipe, and the two water seal assemblies are installed at the top and the bottom of the plugging gate respectively. The two blocking gates are arranged in the tunnel and connected into a whole through the cross beam, the water pressure of the upstream and the water pressure of the downstream are balanced through the flat pressing pipe, and the dry land construction condition between the two blocking gates is achieved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic structure inspection and maintenance technology in water conservancy and hydropower projects, specifically providing a well-applicable and convenient gate for the maintenance and sealing of bottom holes in hydropower projects. Background Technology

[0002] With the vigorous development of water conservancy and hydropower projects in my country, tunnels such as spillway tunnels, sand flushing tunnels, and venting tunnels constructed along with these projects have experienced varying degrees of erosion damage after undergoing high-flow-rate water discharge and sand flushing operations since the projects began operation. To ensure the safety of these hydraulic structures, it is necessary to repair the damaged structures. If not handled properly, internal defects may continue to develop under continued water discharge and sand flushing operations, affecting project safety. Therefore, it is essential to repair these defective hydraulic structures. To provide dry construction conditions for the repair work, it is crucial to study scientific and reasonable plugging schemes.

[0003] Document CN 117367696 A discloses a test device and method for testing the sealing capacity of airbags in large-section tunnels. The device includes an airbag. According to the document, airbag sealing methods are widely used in sealing small pipelines or tunnels, but there is limited experience to draw upon both domestically and internationally for sealing large-scale tunnels. In sealing very large underwater tunnels, the airbag needs to overcome enormous reservoir water pressure. Increased external pressure necessitates high internal pressure in the airbag, and the material of the airbag and its sealing capacity cannot be tested to ensure effective sealing. The problems with this method are: 1. This method relies on the expansion of the airbag after being filled with high-pressure gas, resulting in close contact between the outer wall of the airbag and the inner wall of the tunnel. Under the pressure of the reservoir water, 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. After long-term operation, the inner surface of the tunnel becomes smooth, and its condition is difficult to assess, making it difficult to determine the static friction between the outer wall of the airbag and the inner wall of the tunnel; 2. Different projects have different tunnel shapes, and the airbag device can only be installed in the circular section of the tunnel to be sealed. It overcomes water pressure through the static friction between the outer wall of the airbag and the inner wall of the tunnel, so the airbag structure needs to be of sufficient length. This solution is difficult to adapt to different tunnel shapes; 3. The airbag device is huge, and its manufacturing quality and precision are difficult to guarantee. If air leakage occurs during sealing, the tunnel will not be able to be sealed, 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 venting tunnels is mostly as follows: an emergency plane gate is arranged at the beginning of the pressurized section of the tunnel, and an arc-shaped working gate is arranged at the end of the pressurized section of the tunnel. Therefore, it is possible to consider using the arc-shaped gate to block water as an auxiliary measure of the sealing equipment, and to seal the damaged location of the tunnel for maintenance through the sealing equipment. Summary of the Invention

[0005] The present invention aims to solve the problems existing in the use of airbags for sealing large-section tunnels, and to provide a water and electricity engineering bottom hole maintenance sealing gate that is highly applicable and convenient for sealing.

[0006] This utility model relates to a bottom hole maintenance sealing gate for hydropower projects, installed inside the tunnel on both sides of the maintenance section. The gate is characterized by having two gates: one upstream (upstream sealing gate) and the other downstream (downstream sealing gate), connected as a single unit by a connecting beam. A pressure-equalizing pipe, a steel pipe structure, connects the reservoir water in front of the upstream gate and the water between the downstream gate and the working arc gate. Valve assemblies are installed on the pressure-equalizing pipe, and two sets of water seal assemblies are installed at the top and bottom of the sealing gate, respectively. The sealing gate has a box-like structure containing several cavities, including an equipment cavity, a weighting cavity, and a buoyancy cavity. The equipment cavity is located at the top and bottom of the sealing gate, the buoyancy cavity at the upper part, and the weighting cavity at the lower part.

[0007] The valve assembly includes a maintenance valve and a working valve. The working valve is installed on the pressure equalization pipe, and the maintenance valve is located on the pressure equalization pipe upstream of the working valve. The working valve is used to open or close the passage inside the pressure equalization pipe. After the maintenance valve is closed, the working valve can be maintained.

[0008] The water seal assembly includes a high-pressure gas tank, push rods, guide grooves, a water seal base, and a water seal strip. The high-pressure gas tank is placed in the middle of the equipment cavity. Two sets of guide grooves are respectively set on both sides of the equipment cavity. A water seal base is installed in each set of guide grooves and 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 rods is connected to the water seal base, and the push rods are connected to the high-pressure gas tank by air pipes. The water seal strip wraps 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 pressure block and a fastener. The pressure block and the fastener are both located on the inner wall of the outer end of the water seal base. The water seal strip is fastened to the water seal base by the pressure block and the fastener.

[0010] This utility model of a bottom hole maintenance sealing gate for hydropower projects is scientifically designed and easy to use. Two sealing gates are installed inside the tunnel and connected as a whole by a crossbeam. The pressure equalization pipe is used to balance the water pressure upstream and downstream, achieving dry construction conditions between the two sealing gates. During construction, the gate structure is stable and has a good water-stopping effect, which is conducive to its widespread use. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the water seal assembly.

[0013] Figure 3 This is a diagram illustrating the usage status.

[0014] Among them, the tunnel is 1, the sealing gate is 2, the connecting beam is 3, the pressure equalization pipe is 4, the equipment cavity is 5, the weighting cavity is 6, the buoyancy cavity is 7, the maintenance valve is 8, the working valve is 9, the high-pressure gas tank is 10, the push rod is 11, the guide groove is 12, the water seal base is 13, the water seal strip is 14, the pressure block is 15, and the fastener is 16. Detailed Implementation

[0015] Example 1: A maintenance sealing gate for a hydropower project's bottom hole is installed inside the tunnel, located on both sides of the maintenance section. There are two sealing gates: one located upstream (upstream sealing gate) and the other downstream (downstream sealing gate). The two sealing gates are connected as a whole by a connecting beam. The pressure-equalizing pipe is a steel pipe structure that connects the reservoir water in front of the upstream water-retaining gate and the water between the downstream water-retaining gate and the working arc gate. Valve assemblies are installed on the pressure-equalizing pipe, and two sets of water seal assemblies are installed at the top and bottom of the sealing gate, respectively. The sealing gate has a box structure containing several cavities, including an equipment cavity, a weighting cavity, and a buoyancy cavity. The equipment cavity is located at the top and bottom of the sealing gate, the buoyancy cavity is located at the upper part of the sealing gate, and the weighting cavity is located at the lower part of the sealing gate.

[0016] The valve assembly includes a maintenance valve and a working valve. The working valve is installed on the pressure equalization pipe, and the maintenance valve is located on the pressure equalization pipe upstream of the working valve. The working valve is used to open or close the passage inside the pressure equalization pipe. After the maintenance valve is closed, the working valve can be maintained.

[0017] The water seal assembly includes a high-pressure gas tank with a pressure of not less than 2 MPa, push rods, guide grooves, a water seal base, and a water seal strip. The high-pressure gas tank is placed in the middle of the equipment cavity. Two sets of guide grooves are respectively set on both sides of the equipment cavity, and a water seal base is installed in each set of guide grooves. The water seal base slides along the guide groove. Two push rods are respectively fixed on both sides of the high-pressure gas tank, and the top of the push rods is connected to the water seal base. The push rods and the high-pressure gas tank are connected by air pipes. The water seal strip wraps around the outer end of the water seal base from the inside to the outside. The water seal base is also equipped with pressure blocks and fasteners, which are set on the inner wall of the outer end of the water seal base. The water seal strip is fastened to the water seal base by the pressure blocks and fasteners.

[0018] In use, first move the device to both sides of the section to be repaired, with the two sealing gates located upstream and downstream of the section to be repaired, respectively. Then, turn on the high-pressure air tank, which pushes the push rod through the air pipe. The push rod pushes the water seal base out of the equipment cavity, and the water seal base presses the water seal strip tightly against the inner wall of the tunnel to prevent water from entering. For safety, at least two water seals are installed on each sealing gate. Then, open the working valve to balance the reservoir water pressure borne by the upstream sealing gate with the pressure in front of the working arc gate borne by the downstream sealing gate. Finally, drain the water between the two sealing gates to create dry construction conditions.

Claims

1. A maintenance sealing gate for bottom holes in hydropower projects, installed inside tunnels and located on both sides of the maintenance section, characterized in that... The sealing gate consists of two sections: one upstream (upstream sealing gate) and the other downstream (downstream sealing gate), connected as a single unit by a connecting beam. The pressure equalization pipe is a steel pipe structure that connects the reservoir water in front of the upstream water-retaining gate to the water body between the downstream water-retaining gate and the working arc gate. Valve assemblies are mounted on the pressure equalization pipe, and two sets of water seal assemblies are installed at the top and bottom of the sealing gate, respectively. The sealing gate has a box-like structure containing several cavities, including an equipment cavity, a weighting cavity, and a buoyancy cavity. The equipment cavity is located at the top and bottom of the sealing gate, the buoyancy cavity at the upper part, and the weighting cavity at the lower part.

2. The maintenance and sealing gate for the bottom hole of a hydropower project as described in claim 1, characterized in that... The valve assembly includes a maintenance valve and a working valve. The working valve is installed on the pressure equalization pipe, and the maintenance valve is located on the pressure equalization pipe upstream of the working valve. The working valve is used to open or close the passage inside the pressure equalization pipe. After the maintenance valve is closed, the working valve can be maintained.

3. The maintenance and sealing gate for the bottom hole of a hydropower project as described in claim 1, characterized in that... The water seal assembly includes a high-pressure gas tank, push rods, guide grooves, a water seal base, and a water seal strip. The high-pressure gas tank is placed in the middle of the equipment cavity. Two sets of guide grooves are respectively set on both sides of the equipment cavity. A water seal base is installed in each set of guide grooves and 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 rods is connected to the water seal base, and the push rods are connected to the high-pressure gas tank by air pipes. The water seal strip wraps around the outer end of the water seal base from the inside to the outside.

4. The maintenance and sealing gate for the bottom hole of a hydropower project as described in claim 3, characterized in that... The water seal base is also provided with a pressure block and a fastener. The pressure block and the fastener are both located on the inner wall of the outer end of the water seal base. The water seal strip is fastened to the water seal base by the pressure block and the fastener.

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