Rotor mounting pit self-drainage structure
By designing a self-draining structure and utilizing the height difference and the combination of galvanized steel pipes and stainless steel grate covers, the problem of water accumulation in the rotor installation pit was solved, achieving rapid and effective drainage, reducing energy consumption and maintenance costs, and improving equipment stability and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA HUADONG ENG CORP LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-05-26
AI Technical Summary
In hydropower projects, water accumulation in the rotor installation pit leads to equipment corrosion and foundation damage from soaking, increasing maintenance costs and safety hazards. Existing mechanical pumping solutions are energy-intensive, prone to equipment damage, and require frequent maintenance.
Design a self-flowing drainage structure, including an upper drainage hole, a middle drainage pipe and a lower drainage hole, to achieve self-flowing drainage through the elevation difference. Combine construction adits and self-flowing drainage holes, and use galvanized steel pipes and stainless steel grate covers to ensure smooth water flow.
It enables rapid and effective drainage of accumulated water, reduces energy consumption and maintenance costs, improves equipment stability and safety, and reduces equipment damage and safety hazards.
Smart Images
Figure CN224282722U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a self-draining structure for a rotor mounting pit. It is applicable to the field of hydropower construction technology. Background Technology
[0002] Due to the height restrictions of underground powerhouse excavation in hydropower projects, installation pits need to be dug during the on-site assembly of the generator rotor shaft, serving as a maintenance area. However, during power plant operation, these installation pits are quite deep, with their bottom elevation significantly lower than the surrounding surface drainage ditches, potentially leading to water accumulation over time. If this water cannot be drained promptly, it will affect the installation and maintenance accuracy of the rotor, as well as its operational stability. It may also cause equipment corrosion, foundation soaking damage, and other problems, increasing maintenance costs and safety hazards. Currently, mechanical pumping is commonly used, which suffers from high energy consumption, equipment damage, and frequent maintenance. Therefore, there is an urgent need for an efficient, reliable, and economical gravity-flow drainage structure to solve the drainage problem of the rotor installation pits. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to provide a self-draining structure for rotor mounting pits, addressing the aforementioned problems.
[0004] The technical solution adopted by this utility model is: a self-draining structure for a rotor mounting pit, comprising:
[0005] The upper drainage hole is formed between the installation pit and the construction support hole below the installation pit. The upper end of the upper drainage hole is connected to the bottom of the installation pit, and the lower end of the upper drainage hole is connected to the construction support hole.
[0006] A central drainage pipe is installed inside the construction adit. The upper end of the central drainage pipe is connected to the lower end of the upper drainage hole, and the lower end of the central drainage pipe extends to the drainage ditch at the bottom of the construction adit.
[0007] The lower drainage hole is formed between the construction adit and the gravity drainage hole below the construction adit. The lower drainage hole is connected to the drainage ditch on the bottom slab of the construction adit, and the lower end of the lower drainage hole is connected to the gravity drainage hole.
[0008] A galvanized steel pipe is inserted into the top of the upper drainage hole, and the upper end of the galvanized steel pipe is located at the bottom of the installation pit.
[0009] A stainless steel grate cover is installed on the top of the galvanized steel pipe.
[0010] The central drainage pipe is fixed to the wall of the construction adit using stainless steel strips and nails.
[0011] A galvanized steel pipe is inserted into the top of the lower drainage hole, and the upper end of the galvanized steel pipe is located at the drainage ditch of the bottom plate of the construction support tunnel.
[0012] A stainless steel grate cover is installed on the top of the galvanized steel pipe.
[0013] The beneficial effects of this utility model are: by combining the upper drainage hole, the middle drainage pipe, the lower drainage hole, the construction support hole and the gravity drainage hole, this utility model forms a complete gravity drainage system, which can quickly and effectively drain the water accumulated in the rotor installation pit, ensure a dry environment in the installation pit, and guarantee the stability of rotor installation and operation.
[0014] This invention has low cost. The structure relies on elevation difference to achieve gravity drainage, eliminating the need for mechanical pumping equipment, thus reducing equipment purchase, installation and operation costs, while also reducing energy consumption and saving energy costs.
[0015] This utility model is easy to maintain, has a simple structure, and is not prone to failure. The stainless steel grate cover on the top of the drain hole makes it easy to clean debris. The overall maintenance workload is small, reducing maintenance costs and difficulty.
[0016] This invention is safe and reliable, avoiding the adverse effects of water accumulation on rotor equipment and foundation, improving the service life of the equipment and the safety of the project, and reducing safety hazards caused by water accumulation. Attached Figure Description
[0017] Figure 1 This is a cross-sectional structural diagram of this application.
[0018] Figure 2 This is a schematic diagram of the drainage pipe fixing in this application.
[0019] 1. Upper drainage hole; 2. Middle drainage pipe; 3. Lower drainage hole; 11. Galvanized steel pipe; 12. Stainless steel grate cover; 21. Stainless steel strip; 22. Nail; 23. Drainage ditch at the bottom of the construction support hole. Detailed Implementation
[0020] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0021] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0022] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0023] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.
[0024] like Figure 1 As shown, this embodiment provides a self-draining structure for a rotor installation pit, including an upper drainage hole 1, a middle drainage pipe 2, and a lower drainage hole 3. The upper drainage hole 1 is formed by drilling between the installation pit and the construction support hole below the installation pit. The upper end of the upper drainage hole connects to the bottom of the installation pit, and the lower end of the upper drainage hole connects to the construction support hole. The middle drainage pipe 2 is disposed in the construction support hole. The upper end of the middle drainage pipe connects to the lower end of the upper drainage hole, and the lower end of the middle drainage pipe extends to the drainage ditch at the bottom of the construction support hole. The lower drainage hole 3 is formed by drilling between the construction support hole and the self-draining hole below the construction support hole. The lower drainage hole connects to the drainage ditch at the bottom of the construction support hole, and the lower end of the lower drainage hole connects to the self-draining hole.
[0025] The specific construction method in this embodiment is as follows:
[0026] First, a drainage hole 1 is drilled in the rock mass between the rotor installation pit and the lower construction support tunnel using drilling equipment. After drilling, a galvanized steel pipe 11 is inserted into the drainage hole 1, ensuring that the galvanized steel pipe 11 is stable and can protect the hole wall. A stainless steel grate cover plate 12 is installed on top of the galvanized steel pipe 11.
[0027] Then, stainless steel strips 21 and nails 22 are used to fix the central drainage pipe 2 (see) on the wall of the construction adit. Figure 2 Insert the middle drainage pipe 2 accurately into the bottom of the upper drainage hole 1, and seal the opening of the upper drainage hole 1 with quick-setting cement mortar to ensure the sealing of the connection and prevent water leakage. Connect the bottom of the middle drainage pipe 2 to the drainage ditch 23 on the bottom plate of the construction support tunnel.
[0028] Finally, a connecting lower drainage hole 3 is drilled between the drainage ditch 23 at the bottom of the construction adit and the bottom gravity drainage hole to ensure that water can flow smoothly from the drainage ditch 23 at the bottom of the construction adit into the gravity drainage hole through the lower drainage hole 3, so as to realize the gravity discharge of accumulated water from the rotor installation pit to the gravity drainage hole, and complete the construction of the rotor installation pit layout structure of the entire gravity drainage system.
[0029] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A rotor mounting pit self-flow drainage structure, characterized by, include: The upper drainage hole is formed between the installation pit and the construction support hole below the installation pit. The upper end of the upper drainage hole is connected to the bottom of the installation pit, and the lower end of the upper drainage hole is connected to the construction support hole. A central drainage pipe is installed inside the construction adit. The upper end of the central drainage pipe is connected to the lower end of the upper drainage hole, and the lower end of the central drainage pipe extends to the drainage ditch at the bottom of the construction adit. The lower drainage hole is formed between the construction adit and the gravity drainage hole below the construction adit. The lower drainage hole is connected to the drainage ditch on the bottom slab of the construction adit, and the lower end of the lower drainage hole is connected to the gravity drainage hole.
2. The rotor mounting pit self-drainage structure according to claim 1, characterized in that, A galvanized steel pipe is inserted into the top of the upper drainage hole, and the upper end of the galvanized steel pipe is located at the bottom of the installation pit.
3. The rotor mounting pit self-drainage structure according to claim 2, characterized in that, A stainless steel grate cover is installed on the top of the galvanized steel pipe.
4. The rotor mounting pit self-drainage structure according to claim 1, characterized in that, The central drainage pipe is fixed to the wall of the construction adit using stainless steel strips and nails.
5. The rotor mounting pit self-drainage structure according to claim 1, characterized in that, A galvanized steel pipe is inserted into the top of the lower drainage hole, and the upper end of the galvanized steel pipe is located at the drainage ditch of the bottom plate of the construction support tunnel.
6. The rotor mounting pit self-drainage structure according to claim 5, characterized in that, A stainless steel grate cover is installed on the top of the galvanized steel pipe.