Inverted siphon crossing river arrangement built in a narrow valley subject to debris flow scour

Abstract

This utility model discloses an inverted siphon river-crossing arrangement structure, particularly an inverted siphon river-crossing arrangement structure built on a narrow river valley subject to debris flow scouring, belonging to the technical field of water conveyance engineering structure design and construction. It provides an inverted siphon river-crossing arrangement structure built on a narrow river valley subject to debris flow scouring, which is convenient to construct and can effectively ensure the safe operation of the inverted siphon. The inverted siphon river-crossing arrangement structure includes an inverted siphon body, and at least includes an excavation trench. The excavation depth of the excavation trench is not less than the sum of the maximum depth of debris flow scouring at the bottom of the narrow river valley and the diameter of the inverted siphon water conveyance pipe. The inverted siphon body spanning the narrow river valley is deeply buried at a designated location in the narrow river valley where the inverted siphon body needs to be installed through the excavation trench.

Description

Technical Field

[0001] This utility model relates to an inverted siphon river crossing structure, and more particularly to an inverted siphon river crossing structure built on a narrow river valley subject to debris flow erosion, belonging to the technical field of water conveyance engineering structure design and construction. Background Technology

[0002] Narrow valleys: In mountainous areas, the valleys are deeply incised and the site is narrow, making it difficult to set up tall scaffolding and formwork.

[0003] Debris flow erosion: In high mountain areas, the slope of the valley is steep, and heavy rainfall from upstream sources can easily form large-scale debris flows, causing deep erosion of the valley.

[0004] Inverted siphon: A type of pressurized water conveyance pipeline that passes through valleys, rivers, depressions, roads, and other channels; it is a channel intersection structure. Due to its advantages such as less engineering work, convenient construction, saving energy and materials, low cost, and easy removal of silt, inverted siphons are now widely used in farmland irrigation construction, urban water supply, and large-scale water diversion projects in various countries.

[0005] In mountainous areas, river erosion is significant, valleys are deep, and sites are narrow, making it difficult to set up tall scaffolding and formwork. Conventional inverted siphons with bridge-like pipes installed over the valley cannot meet the on-site construction requirements. At the same time, due to the steep slope of the valley, heavy rainfall upstream can easily cause large-scale debris flows, resulting in deep erosion of the valley. The safety and stability requirements of inverted siphons buried in the valley are high, and maintenance is difficult. Therefore, it is necessary to optimize and innovate conventional cross-river inverted siphon structures to adapt them to engineering construction under special conditions.

[0006] There are two main layout options for implementing inverted siphons: Method 1: A bridge-type inverted siphon is used, where the inverted siphon horizontal pipe section passes over the river valley, and the debris flow in the valley passes below it. The bridge-type inverted siphon involves constructing a pipe bridge over the river valley, with the inverted siphon horizontal pipe section placed on top of the bridge, and the bridge providing support for the inverted siphon horizontal pipe section. Figure 1 As shown; Method Two: A trench-buried inverted siphon type is used. The inverted siphon horizontal pipe section passes beneath the river valley, while the debris flow in the valley passes above it. This is achieved by excavating a shallow trench in the river valley, burying the inverted siphon horizontal pipe section within the trench, and then installing a sand-flushing pipe downstream along the slope of the inverted siphon. Finally, sand and gravel are backfilled into the shallow trench and above the sand-flushing pipe to restore the surface of the valley floor. Figure 2 As shown.

[0007] The main drawbacks of existing technologies are as follows: 1) High requirements for construction site: As a construction pipe bridge, it is necessary to build scaffolding and formwork tens of meters high under the inverted siphon horizontal pipe section, and a construction site with a width of 50 to 70 meters is required. Therefore, it is difficult to meet the above construction conditions when building a bridge-type inverted siphon in a narrow river valley.

[0008] 2) Significant impact on the surrounding area during construction: The construction of bridge-type inverted siphons requires the use of large machinery, which has a wide impact on surrounding buildings, vegetation, and landforms. The noise and vibration have a significant impact on people and animals in the surrounding area. Given the current situation of limited land use, expanding the land acquisition area for trench-buried inverted siphons will also cause significant impact on the surrounding area.

[0009] 3) High construction difficulty: It is difficult to set up a large construction site in the narrow river valley, and there is great interference between various construction equipment and construction procedures, making construction difficult.

[0010] 4) High investment: The above two types of inverted siphon construction have a large construction area, high land acquisition costs, and high construction costs for building tall scaffolding.

[0011] 5) Difficult maintenance: The horizontal pipe section of the inverted siphon is connected to the upstream and downstream channels through the inclined pipe section of the inverted siphon. The water head of the horizontal pipe section of the inverted siphon is generally tens of meters or even more than one hundred meters. During the operation of the inverted siphon, the horizontal pipe section is prone to siltation and blockage. It is difficult and risky to access the horizontal pipe section of the inverted siphon through the inclined pipe section for dredging, resulting in difficult maintenance. Utility Model Content

[0012] The technical problem to be solved by this utility model is to provide a cross-river arrangement structure for an inverted siphon built on a narrow river valley subject to debris flow scouring, which is convenient to construct and operate and can effectively ensure the safe operation of the inverted siphon.

[0013] The technical solution adopted to solve the above-mentioned technical problems is: an inverted siphon cross-river arrangement structure built on a narrow river valley where debris flow scour exists, including an inverted siphon body. The inverted siphon cross-river arrangement structure also includes at least an excavation trench. The excavation depth of the excavation trench is not less than the sum of the maximum depth of debris flow scour at the bottom of the narrow river valley and the diameter of the inverted siphon water conveyance pipe. The inverted siphon body across the narrow river valley is buried deep in the excavation trench at a specified location in the narrow river valley where the inverted siphon body needs to be arranged.

[0014] Furthermore, concrete support piers are installed at the corners of the excavation trench on both sides of the narrow valley, and the two arc-shaped sections of the inverted siphon water pipe that cross the corners of the narrow valley floor are embedded in the corresponding concrete support piers.

[0015] The preferred embodiment of the above scheme is that the inverted siphon cross-river arrangement structure also includes a flushing and desanding system, in which the sediment deposited in the narrow valley bottom section of the inverted siphon water conveyance pipe is discharged from the inverted siphon water conveyance pipe through the flushing and desanding system during inspection.

[0016] Furthermore, the sand flushing and descaling system includes at least a sand flushing pipe, a stop valve, and a sand discharge pipe. One end of the sand flushing pipe is connected to the inverted siphon water supply pipe, the other end of the sand flushing pipe is connected to the stop valve, and the input end of the sand discharge pipe is connected to the stop valve.

[0017] The preferred embodiment of the above scheme is that the flushing and desanding system also includes valve wells and mud wells, with the valve wells and mud wells positioned in a mutually compatible manner next to the excavation trench at the bottom of the narrow river valley. A stop valve is arranged on the flushing pipe passing through the valve well, and the output end of the desanding pipe is located in the mud well.

[0018] Furthermore, the upper ends of the valve well and mud well extend upwards into the backfill layer at the bottom of the narrow river valley, and the open tops of the valve well and mud well are each equipped with a cover plate.

[0019] The preferred embodiment of the above scheme is that the inverted siphon cross-river arrangement structure further includes an inlet pipe, which is fixedly connected to the corresponding inverted siphon water supply pipe along a vertical line perpendicular to the center line of the water supply pipe at the corresponding position of the inverted siphon. A sealing cover is also arranged on the end of the inlet pipe that is not connected to the inverted siphon water supply pipe.

[0020] Furthermore, the inlet pipe and the sand flushing pipe are arranged in a way that is appropriate for their positions on the horizontal section of the inverted siphon water conveyance pipe at the bottom of the narrow river valley.

[0021] The preferred embodiment of the above scheme is that the inverted siphon cross-river arrangement structure further includes a pressure reduction and discharge system, which is arranged perpendicular to the water conveyance centerline of the inverted siphon water conveyance pipe on the inverted siphon body above the mud and sand scour position; before the inverted siphon is overhauled, the stagnant water in the inverted siphon water conveyance pipe is discharged and depressurized through the pressure reduction and discharge system.

[0022] Furthermore, the pressure reduction and discharge system includes a pressure reducing pipe and a pressure reducing valve. The pressure reducing pipe is arranged perpendicular to the center line of the inverted siphon water supply pipe on the inverted siphon body above the mud and sand scour position, and the pressure reducing valve is arranged on the end of the pressure reducing pipe that is not connected to the inverted siphon water supply pipe.

[0023] The beneficial effects of this utility model are as follows: The technical solution provided in this application is based on the existing inverted siphon body. By adding an excavation trench, the inverted siphon cross-river arrangement structure of this application is constructed. The excavation depth of the trench is not less than the sum of the maximum depth of debris flow scouring at the bottom of the narrow river valley and the diameter of the inverted siphon water supply pipe. Finally, the inverted siphon body spanning the narrow river valley is deeply buried in the trench at the designated location in the narrow river valley where the inverted siphon body needs to be arranged. In this way, the technical solution of this application not only draws on the existing technology of using excavation trenches for inverted siphon installation, which saves the amount of engineering work and the construction land occupation significantly, but also sets the excavation depth of the trench to be not less than the sum of the maximum depth of debris flow scouring at the bottom of the narrow river valley and the diameter of the inverted siphon water supply pipe. This effectively ensures that the inverted siphon is not scoured by debris flow during subsequent use after construction, thus achieving a high degree of safe operation. Therefore, this application achieves the invention objective of convenient construction and operation and effectively ensuring the safe operation of the inverted siphon. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an existing inverted siphon structure involved in the inverted siphon cross-river arrangement structure built on a narrow river valley subject to debris flow scouring. Figure 2 This is a schematic diagram of another existing inverted siphon structure involved in the inverted siphon cross-river arrangement structure built on a narrow river valley subject to debris flow erosion, which is part of this utility model. Figure 3 This is a schematic diagram of the inverted siphon cross-river arrangement structure of this utility model, built on a narrow river valley subject to debris flow scouring, with a longitudinal section along the inverted siphon axis. Figure 4 This is a schematic diagram of the longitudinal section of the flushing and desiccation system involved in the inverted siphon cross-river layout structure of this utility model, which is built on a narrow river valley with debris flow scouring. Figure 5 This is a schematic diagram of the plan layout of the flushing and desiccation system involved in the inverted siphon cross-river arrangement structure built on a narrow river valley subject to debris flow scouring, which is a feature of this utility model.

[0025] The following are marked in the diagram: 1. Inverted siphon body; 2. Narrow valley; 3. Concrete support pier; 4. Arc-shaped section; 5. Sand flushing pipe; 6. Stop valve; 7. Sand discharge pipe; 8. Valve well; 9. Mud well; 10. Cover plate; 11. Inlet pipe; 12. Sealing cover plate; 13. Pressure reducing pipe; 14. Pressure reducing valve; 15. Horizontal section. Detailed Implementation

[0026] like Figure 3 , Figure 4 as well as Figure 5This invention illustrates a convenient and safe inverted siphon structure for use in narrow river valleys prone to debris flow erosion, designed for easy construction and operation. The structure includes an inverted siphon body 1 and at least an excavation trench. The excavation depth of the trench is no less than the sum of the maximum depth of debris flow erosion at the bottom of the narrow river valley and the diameter of the inverted siphon. The inverted siphon body 1 is deeply buried in the excavation trench at a designated location within the narrow river valley where it is to be installed. This technical solution is based on existing inverted siphon bodies. By adding an excavation trench, the inverted siphon structure is constructed, ensuring that the excavation depth is no less than the sum of the maximum depth of debris flow erosion at the bottom of the narrow river valley and the diameter of the inverted siphon water pipe. Finally, the inverted siphon body is deeply buried in the excavation trench at a designated location within the narrow river valley where it is to be installed. Thus, the technical solution of this application not only draws on the existing technology of using excavation trenches for inverted siphon installation, which significantly reduces the amount of work and construction land by eliminating the need for full-scale scaffolding, but also sets the excavation depth of the trench to be no less than the sum of the maximum depth of debris flow erosion at the bottom of the narrow river valley and the diameter of the inverted siphon water delivery pipe. This effectively ensures that the inverted siphon is not eroded by debris flow during subsequent use, thus achieving a high degree of safe operation. This achieves the invention's objective of convenient construction and safe operation of the inverted siphon. In conjunction with the existing technology, to maximize the stability of the inverted siphon body 1, this application also sets concrete support piers 3 at the corners of the excavation trench on both sides of the narrow river valley. The two arc-shaped segments 4 of the inverted siphon water delivery pipe crossing the corners at the bottom of the narrow river valley are embedded in the corresponding concrete support piers 3.

[0027] Correspondingly, to accommodate the deeply buried inverted siphon body arrangement of this application, and to facilitate maintenance during operation, the inverted siphon cross-river arrangement structure described in this application also includes a flushing and desanding system. During inspection, sediment deposited in the narrow valley floor section of the inverted siphon water supply pipe is discharged through this system. This flushing and desanding system includes at least a flushing pipe 5, a stop valve 6, and a desanding pipe 7. One end of the flushing pipe 5 is connected to the inverted siphon water supply pipe, and the other end is connected to the stop valve 6. The input end of the desanding pipe 7 is connected to the stop valve 6. To prevent debris flows from burying the flushing and desanding system during operation, this application's system also includes a valve well 8 and a mud well 9. The valve well 8 and mud well 9 are excavated in mutually compatible positions beside the excavation trench at the bottom of the narrow valley. The stop valve 6 is located on the flushing pipe 5 passing through the valve well 8, and the output end of the desanding pipe 7 is located in the mud well 9. More specifically, the upper ends of valve well 8 and mud well 9 extend upwards into the backfill layer at the bottom of the narrow river valley, and the open tops of valve well 8 and mud well 9 are each equipped with a cover plate 10.

[0028] Furthermore, to facilitate access for maintenance personnel and ensure their safety, the inverted siphon cross-river arrangement structure described in this application also includes an inlet pipe 11. The inlet pipe 11 is vertically perpendicular to the center line of the corresponding water supply pipe of the inverted siphon and is fixedly connected to the corresponding inverted siphon water supply pipe. A sealing cover plate 12 is also provided on the end of the inlet pipe 11 not connected to the inverted siphon water supply pipe. The inlet pipe 11 is arranged in a manner appropriate to the position of the sand flushing pipe 5 on the horizontal section 15 of the inverted siphon water supply pipe at the bottom of the narrow river valley. Simultaneously, the inverted siphon cross-river arrangement structure also includes a pressure-reducing discharge system. This system is arranged perpendicular to the center line of the inverted siphon water supply pipe on the inverted siphon body 1 above the mud and sand scouring position. Before maintenance of the inverted siphon body 1, stagnant water located in the inverted siphon water supply pipe is discharged and depressurized through the pressure-reducing discharge system. Specifically, the pressure reduction and discharge system includes a pressure reducing pipe 13 and a pressure reducing valve 14. The pressure reducing pipe 13 is arranged perpendicular to the water conveyance center line of the inverted siphon water conveyance pipe on the inverted siphon body 1 above the mud and sand scour position. The pressure reducing valve 14 is arranged on the end of the pressure reducing pipe 13 that is not connected to the inverted siphon water conveyance pipe.

[0029] In summary, the technical solution provided in this application also has the following advantages: 1) Small construction site requirements: By setting up a sand flushing pipe outlet in the mud well, the sand flushing pipe and the inverted siphon horizontal pipe section can be arranged very closely, greatly reducing the range of sand flushing pipe layout. Considering the construction needs of excavation of inverted siphon, valve well, mud well, concrete pouring, etc., a site 20 meters wide along the river valley direction is usually sufficient to meet the construction requirements.

[0030] 2) Minimal impact on surrounding areas: The construction site requirements are small, and the impact on surrounding buildings, vegetation, and landscape during the construction period is minimal. During construction, noise and vibration have minimal impact on surrounding personnel and animals. After the inverted siphon is completed, the upper part is backfilled with sand and gravel to restore the original surface of the river valley. Only the valve well and mud well are exposed above the riverbed, covering an area of ​​approximately 20 square meters. The project's permanent land occupation is small, and its permanent impact on surrounding buildings, vegetation, and landscape is minimal.

[0031] 3) Low construction difficulty and short construction period: The project layout is compact, and the construction measures mainly include conventional foundation pit excavation, concrete pouring, steel pipe welding, etc. There is little interference between various construction equipment and construction procedures, and the construction difficulty is low; the project progresses quickly and the construction period is saved.

[0032] 4) It has good economic efficiency: the construction scope is small, the land acquisition area is small and the cost is low, the construction difficulty is low and the project investment is low.

[0033] 5) Convenient maintenance of inverted siphon: The installation of inlet pipe and inlet pipe cover plates in the horizontal pipe section of the inverted siphon facilitates the maintenance of the inverted siphon and improves the safety and reliability of the inverted siphon operation.

[0034] 6) Reduced maintenance difficulty of inverted siphons: A pressure-reducing pipe is installed in the inclined section of the inverted siphon, and a pressure-reducing valve is installed at the top of the pressure-reducing pipe. Before opening the inlet pipe cover during maintenance, the pressure-reducing valve is opened first. After the water level in the inverted siphon drops to the elevation of the pressure-reducing pipe, the water pressure in the horizontal section of the inverted siphon is reduced from tens or hundreds of meters to a few meters. This avoids high-pressure water gushing and injury when opening the inlet pipe cover, greatly improving the safety of inverted siphon maintenance personnel.

[0035] Example 1 The technical solution adopted by this application to solve the above-mentioned technical problems is: 1) Suitable for inverted siphons across narrow river valleys. This type of inverted siphon can ensure convenient construction in narrow, deeply incised river valleys, as well as ensure the safety and stability of the inverted siphon structure during debris flow, while also meeting the requirements of convenient maintenance and safety of maintenance personnel.

[0036] 2) Dig a trench in the valley and bury the inverted siphon below the depth of the mudslide scour to ensure that the safety and stability of the inverted siphon are not affected when a mudslide occurs.

[0037] 3) On one side of the river valley, outside the debris flow scouring range, a flushing pipe is installed at the lowest point of the inverted siphon horizontal pipe section, extending downstream (or upstream) into the valley. This flushing pipe connects to a valve well and a mud well. A flushing valve is installed in the valve well, and the flushing pipe outlet is located in the mud well. Installing the flushing valve in the valve well ensures its operation is unaffected by debris flow, improving its reliability. The flushing pipe outlet in the mud well allows for a close arrangement between the flushing pipe and the inverted siphon horizontal pipe section, significantly reducing the area required for flushing pipe installation, minimizing land occupation, and facilitating construction. During inverted siphon operation, the flushing valve is closed; during maintenance, the flushing valve is opened, discharging the accumulated mud and sand from the inverted siphon into the mud well via the flushing pipe, and then pumping the mud and sand into the valley through a mud pump located at the top of the mud well.

[0038] 4) On one side of the river valley, outside the debris flow scouring area, an inlet pipe is installed at the top of the horizontal section of the inverted siphon for maintenance. A cover plate is installed at the top of the inverted siphon. During operation, the inlet pipe cover plate is closed. During maintenance, the inverted siphon cover plate is opened, allowing personnel to enter the inverted siphon for maintenance. The inlet pipe and cover plate facilitate maintenance and improve the safety and reliability of the inverted siphon operation.

[0039] 5) On one side of the river valley, outside the debris flow scouring range, a pressure-reducing pipe is installed on the inclined section of the inverted siphon, with a pressure-reducing valve at the top. During inverted siphon operation, the pressure-reducing valve is closed. During inverted siphon maintenance, the pressure-reducing valve is opened. After the water level inside the inverted siphon drops to the elevation of the pressure-reducing pipe, the internal water pressure in the horizontal section of the inverted siphon decreases from tens or hundreds of meters to a few meters. This prevents high-pressure water inrush from injuring personnel when opening the inlet pipe cover, significantly improving the safety of inverted siphon maintenance personnel and ensuring their safety.

Claims

1. A cross-river inverted siphon structure built on a narrow river valley subject to debris flow erosion, comprising an inverted siphon body (1), characterized in that: The inverted siphon structure across the river includes at least an excavation trench. The excavation depth of the trench is not less than the sum of the maximum depth of debris flow scouring at the bottom of the narrow valley and the diameter of the inverted siphon. The inverted siphon body (1) across the narrow valley is buried deep in the trench at a specified location in the narrow valley (2) where the inverted siphon body (1) needs to be arranged.

2. The inverted siphon structure across a river built on a narrow river valley subject to debris flow erosion, as described in claim 1, is characterized in that: Concrete support piers (3) are also set at the corners of the excavation trench on both sides of the narrow valley. The two arc-shaped sections (4) of the inverted siphon water pipe crossing the corner of the narrow valley bottom are embedded in the corresponding concrete support piers (3).

3. The inverted siphon structure across a river built on a narrow river valley subject to debris flow erosion, as described in claim 1 or 2, is characterized in that: The aforementioned inverted siphon cross-river arrangement structure also includes a flushing and sand removal system, through which sediment deposited in the narrow valley bottom section of the inverted siphon water conveyance pipe is discharged from the inverted siphon water conveyance pipe during inspection.

4. The inverted siphon structure across a river built on a narrow river valley subject to debris flow erosion, as described in claim 3, is characterized in that: The flushing and desanding system includes at least a flushing pipe (5), a stop valve (6) and a desanding pipe (7). One end of the flushing pipe (5) is connected to the inverted siphon water supply pipe, and the other end of the flushing pipe (5) is connected to the stop valve (6). The input end of the desanding pipe (7) is connected to the stop valve (6).

5. The inverted siphon structure across a river built on a narrow river valley subject to debris flow erosion, as described in claim 4, is characterized in that: The flushing and desanding system also includes a valve well (8) and a mud well (9). The valve well (8) and the mud well (9) are positioned in a mutually compatible manner, with the excavation trench located at the bottom of the narrow valley. A stop valve (6) is arranged on the flushing pipe (5) that passes through the valve well (8), and the output end of the desanding pipe (7) is located in the mud well (9).

6. The inverted siphon structure across a river built on a narrow river valley subject to debris flow erosion, as described in claim 5, is characterized in that: The upper ends of the valve well (8) and mud well (9) extend upwards to the backfill layer at the bottom of the narrow valley. The open tops of the valve well (8) and mud well (9) are each equipped with a cover plate (10).

7. The inverted siphon structure across a river built on a narrow river valley subject to debris flow erosion, as described in claim 6, is characterized in that: The inverted siphon cross-river arrangement structure also includes an inlet pipe (11), which is vertically perpendicular to the water supply center line of the corresponding inverted siphon water supply pipe and is fixedly connected to the corresponding inverted siphon water supply pipe. A sealing cover plate (12) is also arranged on the end of the inlet pipe (11) that is not connected to the inverted siphon water supply pipe.

8. The inverted siphon structure across a river built on a narrow river valley subject to debris flow erosion, as described in claim 7, is characterized in that: The inlet pipe (11) and the sand flushing pipe (5) are arranged in a manner appropriate to each other on the horizontal section (15) of the inverted siphon water conveyance pipe at the bottom of the narrow river valley.

9. The inverted siphon structure across a river built on a narrow river valley subject to debris flow erosion, as described in claim 8, is characterized in that: The inverted siphon cross-river arrangement structure also includes a pressure reduction and discharge system, which is arranged on the inverted siphon body (1) above the mud and sand scour position, perpendicular to the water transmission center line of the inverted siphon water transmission pipe. Before the inverted siphon body (1) is overhauled, the stagnant water in the inverted siphon water transmission pipe is discharged and depressurized through the pressure reduction and discharge system.

10. The inverted siphon structure across a river built on a narrow river valley subject to debris flow erosion, as described in claim 9, is characterized in that: The pressure relief system includes a pressure relief pipe (13) and a pressure relief valve (14). The pressure relief pipe (13) is arranged on the inverted siphon body (1) above the mud and sand scour position, perpendicular to the center line of the inverted siphon water supply pipe. The pressure relief valve (14) is arranged on the end of the pressure relief pipe (13) that is not connected to the inverted siphon water supply pipe.

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