A long pressure penstock end gate valve-free penstock emptying system and a working method thereof

Abstract

The application provides a long-pressure penstock emptying system without a gate valve at the end of the penstock and a working method thereof, which comprises a water inlet, a long-pressure penstock, a pressure pipeline and a plant in sequence, a pressure regulating chamber is arranged at the joint of the long-pressure penstock and the pressure pipeline, a construction adit is arranged at the end of the long-pressure penstock, the construction adit is arranged on the upstream side of the pressure regulating chamber, a maintenance gate is arranged at the end of the long-pressure penstock close to the construction adit, a water collecting pit is arranged at the bottom of the long-pressure penstock close to the construction adit, a drain pipe is communicated with the bottom of the water collecting pit, one end of the drain pipe is connected to the outside through the construction adit, a working valve is arranged at the water outlet end of the drain pipe, the water collecting pit is arranged to actively collect seepage water, the construction adit is used as a seepage water leading channel of the long-pressure penstock, and the seepage water in the long-pressure penstock can be effectively drained; the temporary water blocking sandbags can be quickly arranged and removed, and the seepage water can be effectively prevented from flowing into the pressure pipeline downstream.

Description

Technical Field

[0001] This invention relates to the field of long pressure waterway emptying technology, and in particular to a waterway emptying system without gate valve at the end of a long pressure waterway and its working method. Background Technology

[0002] For long pressure water diversion tunnels (tunnels from the inlet to the upstream surge chamber), groundwater often exists within the mountainside, especially under water-rich geological conditions where external water pressure is high. During maintenance, after the pressure water diversion tunnel is drained, external water may seep into the tunnel along lining cracks or permanently reserved drainage holes. Due to the long length of the entire water diversion tunnel, the total leakage volume is large, eventually converging at the end of the water diversion tunnel and flowing into the pressure pipeline. Typically, in this situation, gates or valves need to be installed at the end of the water diversion tunnel. Gates are usually located in the surge chamber, while valves are usually installed in a steel pipe at the end of the upper horizontal section, requiring a separate valve chamber. If gates or valves are missing at the end of the pressure water diversion tunnel or at the surge chamber location in earlier constructed projects, or if pressure pipeline maintenance plans have not been considered, the pressure pipeline will not be able to maintain a water-free state, affecting the maintenance of downstream pressure pipelines and the maintenance or replacement of valves (ball valves or butterfly valves, etc.) in the plant. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a drainage system and its working method for a long pressure water channel without a gate valve at the end, which can solve the problem of water accumulation in the pressure water channel without a gate valve at the end affecting the maintenance of downstream pipelines and facilities.

[0004] Therefore, the present invention adopts the following technical solution: A long pressure water intake channel without a gate valve at the end is disclosed in a water intake channel drainage system, comprising an inlet, a long pressure water intake channel, a pressure pipeline, and a plant building connected in sequence. A pressure regulating chamber is provided at the junction of the long pressure water intake channel and the pressure pipeline. The system also includes a construction adit located on one side of the end of the long pressure water intake channel, upstream of the pressure regulating chamber. A maintenance gate is provided at one end of the construction adit channel near the long pressure water intake channel. A sump is provided at the bottom of the long pressure water intake channel, located near the construction adit. A drain pipe is connected to the bottom of the sump, with one end of the drain pipe connected to the outside through the construction adit. A working valve is provided at the outlet end of the drain pipe.

[0005] Based on the above technical solutions, the present invention may also employ the following further technical solutions, or combine these further technical solutions: The maintenance gate is a single-slot gate that can be manually pushed open from inside the construction tunnel towards the long pressure waterway on the outside.

[0006] The outlet end of the drain pipe is also equipped with a maintenance valve.

[0007] At the bottom of the long pressure waterway, multiple temporary water-blocking sandbags are stacked and placed between the construction adit and the pressure regulating chamber. The temporary water-blocking sandbags are used to block the water flow from the bottom of the long pressure waterway to the pressure pipeline downstream.

[0008] A temporary submersible pump is installed in the sump, and the temporary submersible pump is connected to a hose to introduce the water in the sump into the drainage ditch in the construction tunnel.

[0009] The drainage pipe is a galvanized steel pipe.

[0010] A method for operating a long pressure water intake channel without a gate valve at the end of the water intake channel includes the following steps: Step 1: Near the end of the long pressure water diversion channel, set up a construction adit as an inspection passage, and install an inspection gate that can be opened from the outside inside the construction adit. Step 2: Set up a sump at the bottom of the long pressure water diversion channel at the corresponding location of the construction adit. Set up a drainage pipe at the bottom of the sump leading to the outside of the construction adit. During the maintenance period, the working valve at the outlet of the drainage pipe can be opened directly to release the amount of water that seeps into the tunnel from the mountain in the long pressure water diversion channel. Step 3: Set up temporary sandbags downstream of the long pressure water diversion channel near the construction adit to form a temporary cofferdam, which effectively prevents seepage water in the long pressure water diversion channel from flowing into the downstream pressure pipeline. Step 4: Once the amount of water seeping from the mountain into the cave can be completely discharged or balanced here, the downstream pressure pipeline and valves in the plant can be inspected and repaired.

[0011] In step two, a temporary submersible pump is installed in the sump to increase drainage capacity. The temporary submersible pump is connected to a hose that is directly introduced into the drainage ditch of the construction adit, allowing the water to flow freely out of the adit and into the natural river channel.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects: by setting up a sump to actively collect seepage water and using the construction adit as a seepage outlet channel for the long pressure water diversion channel, the seepage water outside the tunnel in the long pressure water diversion channel can be effectively discharged; by setting up temporary water-blocking sandbags that can be quickly deployed and dismantled, a temporary cofferdam is formed, which effectively prevents the seepage water in the long pressure water diversion channel from flowing into the downstream pressure pipeline. Attached Figure Description

[0013] Figure 1 This is a longitudinal sectional view of the present invention.

[0014] Figure 2 For the present invention Figure 1Cross-sectional view at point AA.

[0015] Figure 3 For the present invention Figure 2 Cross-sectional view at point BB.

[0016] Figure 4 For the present invention Figure 3 Cross-sectional view at point CC. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0019] This invention provides a long pressure water intake channel without gate valve at the end of the water intake channel, including an inlet 1, a long pressure water intake channel 2, a pressure pipeline 5, and a plant 6 connected in sequence. A pressure regulating chamber 4 is provided at the junction of the long pressure water intake channel 2 and the pressure pipeline 5. It also includes a construction adit 3 located on one side of the end of the long pressure water intake channel 2. The construction adit 3 is located upstream of the pressure regulating chamber 4. A maintenance gate 8 is provided at one end of the construction adit 3 near the long pressure water intake channel 2. A water collection pit 7 is provided at the bottom of the long pressure water intake channel 2. The water collection pit 7 is located near the construction adit 3. A drain pipe 9 is connected to the bottom of the water collection pit 7. One end of the drain pipe 9 is connected to the outside through the construction adit 3. A working valve 11 is provided at the outlet end of the drain pipe 9.

[0020] After the water used for power generation is discharged in the long pressure water diversion channel 2, seepage water will be generated from outside the tunnel to inside the tunnel. This water flow will gather at the end of the long pressure water diversion channel 2 and be discharged outside the construction adit 3 through the drainage pipe 9 at the bottom of the water collection pit 7 and introduced into the natural river channel.

[0021] The maintenance gate 8 is a single-slot gate that can be manually pushed open from inside the construction adit 3 towards the long pressure waterway 2 on the outside.

[0022] The outlet end of the drain pipe 9 is also equipped with a maintenance valve 10.

[0023] At the bottom of the long pressure waterway 2, multiple temporary water-blocking sandbags 13 are stacked. The temporary water-blocking sandbags 13 are placed between the construction adit 3 and the pressure regulating chamber 4. The temporary water-blocking sandbags 13 are used to block the water flow at the bottom of the long pressure waterway 2 to its downstream pressure pipe 5.

[0024] Because the long pressure water channel 2 is long and has a large overall leakage, if the leakage exceeds the drainage capacity of the sump 7 and the drain pipe 9, the water flow will be further blocked by temporary water-blocking sandbags 13 to prevent it from flowing into the downstream pressure pipe 5.

[0025] A temporary submersible pump 15 is installed in the sump pit 7. The temporary submersible pump 15 is connected to a hose to introduce the water in the sump pit 7 into the drainage ditch in the construction adit 3.

[0026] Drainage pipe 9 is a galvanized steel pipe.

[0027] The attached diagram also shows structural joint 12 and upstream water inflow 14.

[0028] A method for operating a long pressure water intake channel without a gate valve at the end of the water intake channel includes the following steps: Step 1: Near the end of the long pressure water diversion channel 2, set up a construction adit 3 as a maintenance passage, and set up a maintenance gate 8 that can be opened from the outside in the construction adit 3. Step 2: At the bottom of the long pressure water diversion channel 2 at the corresponding position of the construction adit 3, a water collection pit 7 is set up. A drainage pipe 9 leading to the outside of the construction adit 3 is set up at the bottom of the water collection pit 7. During the maintenance period, the working valve 11 at the outlet of the drainage pipe 9 can be opened directly to release the amount of water seeping into the tunnel from the mountain in the long pressure water diversion channel 2. Step 3: Downstream of the long pressure water diversion channel 2 near the construction adit 3, set up temporary water-blocking sandbags 13 to form a temporary cofferdam, effectively preventing seepage water in the long pressure water diversion channel 2 from flowing into the downstream pressure pipeline 5. Step 4: Once the amount of water seeping from the mountain into the cave can be completely discharged or balanced here, the downstream pressure pipeline 5 and the valves in the plant can be inspected and repaired.

[0029] In step two, a temporary submersible pump 15 is installed in the sump to increase drainage capacity. The temporary submersible pump 15 is connected to a hose and directly introduced into the drainage ditch of the construction adit 3, flowing freely out of the adit and into the natural river channel.

[0030] In step one, the maintenance gate 8 must be a single-slot gate, and the size of the maintenance gate 8 must be small enough to meet the convenience of maintenance, so that it can be manually pushed open from the outside to the inside after the long pressure water channel 2 is emptied.

[0031] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use the waterway venting system without gate valves at the end of a long pressure waterway, and can achieve the positive effects described in this invention.

[0032] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "installed," "set," "equipped with," "connected," "linked," and "sleeve" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral construction; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two mechanisms, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In the description of this invention, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0034] Furthermore, in practicing the claims of this invention, those skilled in the art can understand and influence variations to the disclosed embodiments through a study of the drawings, the disclosure, and the appended claims. Additionally, in the claims and description, words such as "comprising" and "containing" do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes and modifications made in accordance with the present invention are covered by the scope of the claims of the present invention, and will not be listed here.

Claims

1. A long pressure water channel without gate valve at the end of a water channel for draining water, comprising an inlet (1), a long pressure water channel (2), a pressure pipeline (5), and a plant (6) connected in sequence, wherein a pressure regulating chamber (4) is provided at the junction of the long pressure water channel (2) and the pressure pipeline (5), characterized in that, It also includes a construction adit (3) located on one side of the end of the long pressure water channel (2). The construction adit (3) is located on the upstream side of the pressure regulating chamber (4). A maintenance gate (8) is provided at one end of the construction adit (3) near the long pressure water channel (2). A water collection pit (7) is provided at the bottom of the long pressure water channel (2). The water collection pit (7) is located near the construction adit (3). A drain pipe (9) is connected to the bottom of the water collection pit (7). One end of the drain pipe (9) is connected to the outside through the construction adit (3). A working valve (11) is provided at the outlet end of the drain pipe (9).

2. The long pressure water intake channel emptying system without a gate valve at the end, as described in claim 1, is characterized in that... The maintenance gate (8) is a single-slot gate that can be manually pushed open from inside the construction tunnel (3) towards the long pressure waterway (2) on the outside.

3. The long pressure water intake channel emptying system without a gate valve at the end, as described in claim 1, is characterized in that... The outlet end of the drain pipe (9) is also equipped with a maintenance valve (10).

4. The long pressure water intake channel emptying system without a gate valve at the end, as described in claim 1, is characterized in that... Multiple temporary water-blocking sandbags (13) are stacked at the bottom of the long pressure water channel (2). The temporary water-blocking sandbags (13) are placed between the construction adit (3) and the pressure regulating chamber (4). The temporary water-blocking sandbags (13) are used to block the water flow from the bottom of the long pressure water channel (2) to the pressure pipe (5) downstream.

5. The long pressure water intake channel emptying system without a gate valve at the end, as described in claim 1, is characterized in that... A temporary submersible pump (15) is installed in the water collection pit (7). The temporary submersible pump (15) is connected to a hose to introduce water from the water collection pit (7) into the drainage ditch in the construction adit (3).

6. The long pressure water intake channel emptying system without a gate valve at the end as described in claim 1, characterized in that, The drainage pipe (9) is a galvanized steel pipe.

7. The operating method of a long pressure water intake channel emptying system without a gate valve at the end, as described in claim 1, is characterized in that... Includes the following steps: Step 1: Near the end of the long pressure water diversion channel (2), a construction adit (3) is set up as an inspection passage. An inspection gate (8) that can be opened from the outside is set up in the construction adit (3). Step 2: At the bottom of the long pressure water diversion channel (2) at the corresponding position of the construction adit (3), a water collection pit (7) is set up. A drainage pipe (9) leading to the outside of the construction adit (3) is set up at the bottom of the water collection pit (7). During the maintenance period, the working valve (11) at the outlet of the drainage pipe (9) can be opened directly to release the amount of water seeping into the cave from the mountain in the long pressure water diversion channel (2). Step 3: Downstream of the long pressure water diversion channel (2) near the construction adit (3), set up temporary water-blocking sandbags (13) to form a temporary cofferdam, which effectively prevents the seepage water in the long pressure water diversion channel (2) from flowing into the downstream pressure pipeline (5); Step 4: At this point, once the amount of water seeping from the mountain into the cave can be completely discharged or balanced, the downstream pressure pipeline (5) and the valves in the plant can be inspected and repaired.

8. The operating method of a long pressure water intake channel emptying system without a gate valve at the end, as described in claim 7, is characterized in that... In step two, a temporary submersible pump (15) is installed in the sump to increase drainage capacity. The temporary submersible pump (15) is connected to a hose and directly introduced into the drainage ditch of the construction adit (3), flowing freely out of the adit and into the natural river channel.

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