A permanent and temporary combined reinforced concrete volute structure of circulating water pump house

Abstract

The utility model relates to a spiral case pump technical field discloses a permanent and temporary combined circulating water pump house reinforced concrete spiral case structure, including the spiral case body of reinforced concrete layer, the stainless steel lining is arranged in the spiral case body, the lining covers the inner surface of spiral case body, sets up peg on the contact surface of lining and spiral case body, and the concrete layer of peg and spiral case body is bonded integrally, and the section of spiral case body inner empty channel includes circular section or square section. Through the structure, the lining is permanent anticorrosive coating of reinforced concrete, and also is the formwork support of construction period, guarantees the smooth and even characteristics of concrete spiral case inside, guarantees the flow state of high -speed water flow, also strengthens the anticorrosive property of concrete, can also be used as the formwork support system of construction period simultaneously, reduces the difficulty of formwork assembly, demolition of construction period.

Description

Technical Field

[0001] This utility model relates to the field of volute pump technology, and in particular to a reinforced concrete volute structure for a permanent-temporary combined circulating water pump house used in the conventional island of thermal power plants or nuclear power plants. Background Technology

[0002] Pumps are commonly used equipment in thermal power plants, among which circulating water pumps are characterized by high power and high head, making pump selection crucial in power plant design. Volute pumps, with their smooth flow and excellent hydraulic performance, are frequently used in nuclear power projects and are increasingly employed in thermal power projects. Volute pumps are divided into reinforced concrete volute pumps and steel structure volute pumps (equipment).

[0003] Steel-structured volute pumps are relatively reliable in manufacturing, but their corrosion resistance is relatively poor, and their cost is relatively high. Reinforced concrete volute pumps, on the other hand, have a complex system. During concrete pouring, the formwork system is complex and difficult to erect; concrete vibration is also challenging. After construction, due to the shrinkage difference between the concrete and the formwork, as well as issues with concrete vibration, the inner surface of the volute will have varying degrees of roughness, voids, and other defects. These defects ultimately lead to changes in the water flow characteristics within the volute, and in severe cases, may erode the concrete and reinforcing steel. Reinforced concrete volute pumps also have certain corrosion resistance issues under specific conditions such as seawater, especially under the high-speed water flow inside the volute, where corrosion is further exacerbated. Utility Model Content

[0004] The purpose of this utility model is to provide a reinforced concrete volute structure for a circulating water pump house that combines permanent and temporary features, thereby solving the problems of imperfections on the inner surface of the volute altering water flow characteristics and exacerbating corrosion in the prior art.

[0005] This utility model is achieved through the following solution: A permanent-temporary combined reinforced concrete spiral casing structure for a circulating water pump house includes a spiral casing body with a reinforced concrete layer, a stainless steel liner inside the spiral casing body covering the inner surface of the spiral casing body, studs on the contact surface between the liner and the spiral casing body, and studs bonded to the concrete layer of the spiral casing body. The cross-section of the hollow channel inside the spiral casing body includes a circular cross-section or a square cross-section.

[0006] Furthermore, the internal hollow channel includes a water outlet section and a volute section. The water outlet section is lined with a spliced ​​section with a circular opening at one end, while the volute section is lined with an integral spiral shell.

[0007] Furthermore, studs are arranged on the outer surface of the lining, along the radial and circumferential directions of the lining.

[0008] Furthermore, the lining and studs are prefabricated as a single unit.

[0009] Furthermore, the inner lining located at the bottom of the volute body has anti-buoyancy steel bars on its outer surface, which are tied to the outer concrete main reinforcement.

[0010] Furthermore, it also includes a temporary support system, which consists of multiple X-shaped or cross-shaped support plates. When in use, these plates are installed in the hollow channels surrounded by the lining and are removed after the concrete has hardened.

[0011] Furthermore, X-shaped or cross-shaped support plates are arranged in the inner hollow channel at a predetermined interval along the spiral ring, with the outer periphery abutting against the inner lining.

[0012] Furthermore, the outer ring of the X-shaped support plate is circular, making it suitable for circular cross-section supports.

[0013] Furthermore, the outer ring of the cross-shaped support plate is square, making it suitable for square cross-section supports.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. The stainless steel lining serves both as an anti-corrosion coating and shape protection for the concrete casing during operation, and as a formwork support during construction. It ensures the proper flow of water within the casing and enhances the durability of the concrete.

[0015] 2. The stainless steel lining, in conjunction with the temporary support system, serves as a combination of permanent and temporary measures during the construction and operation periods, saving on project costs, ensuring the hydraulic characteristics of the spiral casing, and reducing the difficulty of formwork assembly and dismantling during the construction period. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the concrete spiral casing and temporary support arrangement structure of this utility model; Figure 2 This is a schematic diagram of the stainless steel liner structure of this utility model; Figure 3 This is a schematic diagram of the X-shaped support plate of this utility model; Figure 4 This is a schematic diagram of the cross-shaped support plate of this utility model; Figure label: 1-Vortex casing body; 11-Outlet section; 12-Vortex chamber section; 13-Inlet section; 2-Inner lining; 3-Stud; 4-Anti-buoyancy reinforcement; 5-Temporary support system; 51-X-type support plate; 52-Cross-type support plate; Detailed Implementation All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0017] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", 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 utility model and simplifying the description, and do not indicate or imply that the device or component 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 utility model.

[0019] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0020] like Figures 1-2 As shown, a permanent-temporary combined reinforced concrete spiral casing structure for a circulating water pump house is provided. It includes a reinforced concrete spiral casing body 1, with a stainless steel liner 2 inside the casing body 1. The liner 2 covers the inner surface of the casing body 1. The liner 2 serves as a permanent anti-corrosion coating for the reinforced concrete and also acts as a formwork support for the concrete spiral casing during construction. This replaces the original concrete support formwork, reduces the difficulty of demolding inside the spiral casing, achieves a permanent-temporary combination, and saves costs. Because the liner 2 is smooth, it ensures the flatness and smoothness of the poured concrete surface. Simultaneously, it ensures the flatness and smoothness of the water flow boundary inside the spiral casing during use, reducing the erosion of the concrete by the water flow during later operation and ensuring high-speed water flow characteristics. The stainless steel liner 2 is bonded to the concrete to form an integral whole. Precast studs 3 are provided on the outside of the liner 2 to ensure reliable bonding between the stainless steel liner 2 and the volute. The studs 3 are welded to the outside of the liner 2. Specifically, the studs 3 and the liner 2 are precast as a whole. This ensures the accuracy of the volute liner 2. On-site work only requires hoisting, positioning and concrete pouring of the liner 2, which greatly simplifies the on-site procedures.

[0021] The studs 3 are arranged on the outer surface of the liner 2, and can specifically be cylindrical head welded studs. The studs 3 are arranged in an array, along the radial and circumferential directions, generally using a staggered quincunx pattern or a rectangular array. In another embodiment, the spacing of the studs 3 is adjusted according to the regional situation. Based on the position, size, and stress of each section of the internal hollow channel, such as the water outlet section 11, the volute section 12, and the water inlet section 13, the spacing is reduced and the density is increased.

[0022] The liner 2 of the water outlet section 11 is formed by multiple stainless steel sheets interlaced to form a cylindrical shape, with a circular opening at the outward end; the liner 2 of the volute section 12 is an integral spiral shell, and the cross-section of the internal hollow channel includes a circular cross-section or a square cross-section.

[0023] The inner liner 2 located at the bottom of the volute body 1 has anti-buoyancy steel bars 4 on its outer surface. One end of the anti-buoyancy steel bars 4 is welded to the outer surface of the bottom inner liner 2, and the other end extends outward and is tied to the outer concrete main reinforcement. In another embodiment, pre-welded connectors can be used to connect with the outer concrete main reinforcement. This ensures that the stainless steel inner liner 2 is not affected by the buoyancy of the liquid concrete during concrete pouring.

[0024] Because the lining 2 has poor stability during concrete pouring, a temporary support system 5 is installed inside the lining 2 to ensure stability during construction. For example... Figures 3-4 As shown, since the cross-section of the hollow channel inside the volute body 1 includes either a circular or square cross-section, the temporary support system 5 corresponds to multiple X-shaped support plates 51 or cross-shaped support plates 52. The outer ring of the X-shaped support plate 51 is circular, suitable for supporting circular cross-sections, while the outer ring of the cross-shaped support plate 52 is square, suitable for supporting square cross-sections. Specifically, they can be arranged at preset intervals along the hollow channel, with their outer periphery abutting against the inner lining 2. In use, the support is placed within the hollow channel surrounded by the inner lining 2 and removed after the concrete has hardened.

[0025] This utility model uses a concrete volute pump for circulating water pumps. A stainless steel inner lining that also serves as a formwork is installed inside the concrete, forming a permanent-temporary combined structure in conjunction with temporary supports. Through these measures, the smooth and flat characteristics of the inner side of the concrete volute are ensured, the flow pattern of high-speed water is guaranteed, and the corrosion resistance of the concrete is enhanced. At the same time, it can also serve as a formwork support system during construction. It saves costs, ensures the hydraulic characteristics of the volute, and reduces the difficulty of formwork assembly and dismantling during construction, making it suitable for widespread application.

[0026] This permanent-temporary combined reinforced concrete spiral casing structure for circulating water pump houses is not limited to implementation in conventional island circulating water pump houses of large thermal power plants or nuclear power plants cooled by seawater. It is highly economical and suitable for highly corrosive water qualities such as seawater.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reinforced concrete spiral casing structure for a combined permanent and temporary circulating water pump house, characterized in that, The volute body (1) is made of reinforced concrete. A stainless steel liner (2) is provided inside the volute body (1). The liner (2) covers the inner surface of the volute body (1). A stud (3) is provided on the contact surface between the liner (2) and the volute body (1). The stud (3) is bonded to the concrete layer of the volute body (1). The cross-section of the hollow channel inside the volute body (1) includes a circular cross-section or a square cross-section.

2. The reinforced concrete spiral casing structure of a combined permanent and temporary circulating water pump house as described in claim 1, characterized in that, The internal hollow channel includes a water outlet section (11) and a volute section (12). The water outlet section (11) has a liner (2) that is a spliced ​​section with a circular opening at one end, and the volute section (12) has a liner (2) that is an integral spiral shell.

3. The reinforced concrete spiral casing structure of a permanent-temporary combined circulating water pump house as described in claim 1, characterized in that, The studs (3) are arranged on the outer surface of the liner (2) in both radial and circumferential directions.

4. The reinforced concrete spiral casing structure of a permanent-temporary combined circulating water pump house as described in claim 2, characterized in that, The lining (2) and the studs (3) are prefabricated as a single unit.

5. The reinforced concrete spiral casing structure of a combined permanent and temporary circulating water pump house as described in claim 1, characterized in that, The inner lining (2) located at the bottom of the volute body (1) has anti-buoyancy steel bars (4) on its outer surface, and the anti-buoyancy steel bars (4) are tied to the outer concrete main reinforcement.

6. The reinforced concrete spiral casing structure of a permanent-temporary combined circulating water pump house as described in claim 1, characterized in that, It also includes a temporary support system (5), which includes multiple X-shaped support plates (51) or cross-shaped support plates (52), which are installed in the hollow channel surrounded by the inner lining (2) when in use and are removed after the concrete solidifies.

7. The reinforced concrete spiral casing structure of a combined permanent and temporary circulating water pump house as described in claim 6, characterized in that, The X-shaped support plate (51) or cross-shaped support plate (52) is arranged in the inner hollow channel, and is arranged at a preset interval along the spiral ring, with the outer periphery abutting against the inner lining (2).

8. The reinforced concrete spiral casing structure of a permanent-temporary combined circulating water pump house as described in claim 7, characterized in that, The outer ring of the X-shaped support plate (51) is circular, which is suitable for circular cross-section support.

9. The reinforced concrete spiral casing structure of a permanent-temporary combined circulating water pump house as described in claim 7, characterized in that, The outer ring of the cross-shaped support plate (52) is square, which is suitable for square cross-section support.

Images