Culvert pipe and vacuum siphon double-pipeline collaborative diversion system

Abstract

The utility model discloses a culvert pipe and vacuum siphon double-pipeline collaborative diversion system, and relates to the technical field of diversion facilities of water conservancy projects. Comprising an upstream barrage built at the upstream of a construction river reach; the downstream barrage is built at the downstream of the construction river reach; the culvert pipe flow guide device firstly penetrates through the upstream barrage, then penetrates through the downstream barrage and finally discharges water to the downstream water outlet; and the vacuum siphon device firstly crosses the upstream barrage, then penetrates through the downstream barrage and finally discharges water to the downstream water outlet. The water level of the upstream barrage is higher than the water level of the downstream barrage, and a water level difference is formed. Through double guarantee of culvert pipe diversion and vacuum siphoning, accurate control over water flow in the construction process is achieved, the construction efficiency is improved, and the influence on the surrounding environment is reduced; and in addition, quick mounting and dismounting are facilitated, so that the construction cost is further reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of water conservancy engineering diversion facilities, specifically to a dual-pipe diversion system combining culvert and vacuum siphon. Background Technology

[0002] Currently, waterway construction diversion projects mainly employ two technical solutions: The first is a water-based operation system based on vessel equipment, primarily relying on dredgers, drilling and blasting vessels, and other equipment for dredging. While this solution offers good terrain adaptability, it suffers from significant drawbacks such as a long construction period and substantial disruption to the riverbed's ecological environment. The second solution combines dry-land excavation with cofferdam diversion technology, creating a waterless working surface through segmented enclosures. However, this method is prone to secondary engineering problems such as slope instability.

[0003] Regarding the selection of specific diversion structures, the industry typically adopts two solutions: cofferdam-based segmented diversion and riverbed-intercepting pipeline diversion. While cofferdam-based segmented diversion can maintain navigation, in sandy riverbeds with high permeability, cofferdam collapses due to seepage frequently occur, affecting construction safety and significantly extending the project period. Traditional intercepting pipeline solutions, in hilly areas with drastic water level fluctuations, suffer from frequent siphon interruptions due to gas-liquid two-phase flow. Actual engineering monitoring data shows that their water conveyance efficiency can decrease by more than 30%, making it difficult to meet the diversion requirements under complex hydrological conditions. Utility Model Content

[0004] The purpose of this invention is to provide a dual-pipeline coordinated flow guiding system of culvert and vacuum siphon. Through the coordinated operation mechanism of gravity flow guiding of culvert and vacuum negative pressure siphon, a dual-mode dynamic complementary flow guiding system is constructed, which significantly improves the construction controllability and environmental compatibility under complex geological conditions.

[0005] To achieve the above objectives, this application proposes a dual-pipe flow guiding system combining a culvert and a vacuum siphon, comprising:

[0006] The upstream dam is built upstream of the construction section of the river;

[0007] The downstream dam is built downstream of the construction section of the river;

[0008] The culvert diversion device first passes through the upstream dam, then through the downstream dam, and finally discharges the water to the downstream outlet.

[0009] The vacuum siphon device first crosses the upstream dam and then passes through the downstream dam, finally discharging the water to the downstream outlet.

[0010] In one embodiment, the water level of the upstream dam is higher than that of the downstream dam, creating a water level difference.

[0011] In one embodiment, the culvert diversion device is fitted with pipes at the points where it contacts the upstream and downstream dams.

[0012] In one embodiment, a pipe is fitted around the part of the vacuum siphon device that contacts the downstream dam.

[0013] In one embodiment, the culvert guiding device is made of steel corrugated pipe.

[0014] In one embodiment, the vacuum siphon device uses a siphon steel pipe to accelerate the drop in water level when the culvert guiding device cannot meet the flow requirements.

[0015] In one embodiment, the vacuum siphon device is equipped with a butterfly valve that can be used both manually and electrically.

[0016] In one embodiment, the steel corrugated pipe is constructed by connecting multiple sections of steel corrugated short pipes using flanges.

[0017] In one embodiment, the siphon steel pipe is a one-piece molded structure and has a bend that can cross the upstream dam.

[0018] In one embodiment, the bending portion is formed by connecting multiple siphon elbows.

[0019] Compared with existing technologies, the above-mentioned technical solution adopted in this utility model has the following advantages: This application uses a combination of culvert gravity flow and vacuum siphon, effectively overcoming three major problems in traditional waterway engineering construction: low construction efficiency, significant environmental impact, and construction difficulties under sandy geological conditions. Through the dual mechanism of culvert guidance and vacuum siphon, not only is precise control of water flow achieved during construction, significantly improving construction efficiency, but also the impact on the surrounding ecological environment is greatly reduced. In addition, installation and dismantling are more convenient, thereby further saving construction costs. Attached Figure Description

[0020] Figure 1 Top view of a dual-pipe flow guiding system combining culvert and vacuum siphon;

[0021] Figure 2 Side view of a dual-pipe flow diversion system combining culvert and vacuum siphon;

[0022] Figure 3 The flow rate diagram for two DN3000 steel corrugated pipes under different head differences is shown in the example.

[0023] Figure 4 This is a flow rate diagram of two DN1200 siphon steel pipes under different head differences in the example;

[0024] Figure 5 This is a flow rate diagram for the four pipes under different head differences in the example;

[0025] Among them: 1. Upstream dam, 2. Corrugated steel pipe, 3. Downstream dam, 4. Siphon steel pipe, 41. Hand-operated and electric butterfly valve, 42. Bending section. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device 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 application.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] like Figure 1-2 As shown, this embodiment provides a dual-pipe flow guiding system combining a culvert and a vacuum siphon, comprising:

[0031] The upstream dam is built upstream of the construction section of the river; it is used to raise the water level and form the water level difference required for diversion. By raising the upstream water level, the driving force of gravity flow and vacuum siphon of the culvert is ensured.

[0032] The downstream dam is built downstream of the construction section of the river; it is used to stabilize the downstream water level, and work with the upstream dam to form a water level difference, thereby maintaining a stable drainage environment and preventing backflow from interfering with the construction.

[0033] The culvert diversion device passes through both the upstream and downstream dams to guide the upstream water flow to the downstream outlet. This device uses corrugated steel pipes, preferably DN3000, connected by multiple short pipe flanges for easy transportation and on-site assembly. It should be noted that the contact points between the corrugated steel pipes and the upstream and downstream dams are sealed with fitted pipes to prevent leakage. This device provides stable and controllable gravity-flow diversion and is suitable for normal flow conditions.

[0034] The vacuum siphon device first crosses the upstream dam, then passes through the downstream dam, and finally discharges water to the downstream outlet. This device uses a one-piece molded siphon steel pipe, preferably a DN1200 steel pipe, with a bend section crossing the upstream dam. This bend section is formed by connecting multiple siphon elbows at different angles to optimize suction and drainage efficiency. A manual or electric butterfly valve is installed on the siphon steel pipe between the upstream and downstream dams, allowing for manual or electric control of the siphon's opening and closing. When the culvert flow is insufficient, the vacuum siphon technology quickly pumps out accumulated water, significantly accelerating the drop in water level.

[0035] The workflow of the above system is as follows:

[0036] Normal operating conditions: Water flows out by gravity through the culvert diversion device, and stable diversion is achieved by relying on the water level difference between the upstream and downstream.

[0037] Peak / emergency conditions: The vacuum siphon device is activated by the butterfly valve, and the negative pressure effect is used to accelerate drainage and solve the bottleneck problem of culvert flow.

[0038] This embodiment performs hydraulic calculations on the above-mentioned culvert and vacuum siphon dual-pipe coordinated flow diversion system to verify the water conveyance performance of the system under different head conditions.

[0039] 1) Corrugated pipe flow capacity calculation: According to design requirements, the predetermined water flow rate is 25m³ / h. 3 / s, such as Figure 3 As shown, when the water level difference reaches 1.2m, the combined flow rate of the two DN3000 steel corrugated pipes can meet 25m³ / h. 3 / s; while with the cofferdam filled with water at a head of 3m, the maximum water conveyance capacity can reach 40.26m. 3 / s.

[0040] (2) Calculation of the flow capacity of the vacuum siphon jet pipe: It is proposed to use two DN1200 steel pipes, which will be installed with a manual / electric butterfly valve after crossing the upstream dam. The total length of the pipeline is approximately 600m, and its bends are connected by four siphon elbows with bend angles of 104.8°, 165.4°, 157.2°, and 157.2° respectively. Figure 4 As shown, when the water level difference is 1.2m, the water conveyance of a single DN1200 pipe is approximately 1.62m³. 3 / s, the two lines together total approximately 3.24m 3 / s; with the cofferdam holding water at a head of 3m, the maximum water conveyance capacity of a single pipe and the total capacity can reach approximately 1.48m. 3 / s and 5.12m 3 / s.

[0041] Combining two diversion technologies, such as Figure 5 As shown, this scheme can guarantee a 25m water head under a 1.0m backwater height. 3 With a flow rate of / s, and assuming the cofferdam is used to impound water at a head of 3m, the maximum water conveyance capacity is 45.38m. 3 / s.

[0042] Therefore, this embodiment achieves efficient and stable water conveyance under different head conditions by reasonably configuring DN3000 steel corrugated pipe and DN1200 steel pipe, which meets the 25m water conveyance required for normal operation. 3 The project meets the flow rate requirement of / s and provides greater water delivery capacity under higher head conditions, ensuring the safe and reliable operation of the project.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A dual-pipe flow guiding system combining culvert and vacuum siphon, characterized in that, include: The upstream dam is built upstream of the construction section of the river; The downstream dam is built downstream of the construction section of the river; The culvert diversion device first passes through the upstream dam, then through the downstream dam, and finally discharges the water to the downstream outlet. The vacuum siphon device first crosses the upstream dam and then passes through the downstream dam, finally discharging the water to the downstream outlet.

2. The culvert and vacuum siphon dual-pipe coordinated flow guiding system according to claim 1, characterized in that, The water level at the upstream dam is higher than that at the downstream dam, creating a water level difference.

3. The culvert and vacuum siphon dual-pipe coordinated flow guiding system according to claim 1, characterized in that, The culvert diversion device is fitted with pipes at the points where it contacts the upstream and downstream dams.

4. The culvert and vacuum siphon dual-pipe coordinated flow guiding system according to claim 1, characterized in that, The vacuum siphon device is fitted with a pipe at the point where it contacts the downstream dam.

5. The culvert and vacuum siphon dual-pipe coordinated flow guiding system according to claim 1, characterized in that, The culvert guiding device uses a steel corrugated pipe.

6. The culvert and vacuum siphon dual-pipe coordinated flow guiding system according to claim 1, characterized in that, The vacuum siphon device uses a siphon steel pipe to accelerate the drop in water level when the culvert diversion device cannot meet the flow requirements.

7. The culvert and vacuum siphon dual-pipe coordinated flow guiding system according to claim 6, characterized in that, The vacuum siphon device is equipped with a butterfly valve that can be used both manually and electrically.

8. The culvert and vacuum siphon dual-pipe coordinated flow guiding system according to claim 5, characterized in that, The steel corrugated pipe is constructed by connecting multiple sections of steel corrugated short pipes with flanges.

9. The culvert and vacuum siphon dual-pipe coordinated flow guiding system according to claim 6, characterized in that, The siphon steel pipe is a one-piece molded structure and has a bend that can cross the upstream dam.

10. The culvert and vacuum siphon dual-pipe coordinated flow guiding system according to claim 9, characterized in that, The bending section is formed by connecting multiple siphon elbows.

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