Hydropower station ground workshop superstructure and installation method

Abstract

The invention discloses a superstructure of a hydropower station ground workshop. The superstructure comprises a steel structure roof system, a steel structure crane beam and a steel structure bent frame. The steel structure roof system comprises a steel roof panel and a steel net rack, the steel roof panel is fixedly connected with the steel net rack through screws, the steel structure crane beam comprises a steel crane beam and a steel reinforcing plate, the steel reinforcing plate and the steel crane beam are welded and fixed to be used for reinforcing the bearing capacity of the steel crane beam, and the steel structure bent frame comprises a steel bent frame, a steel column and a steel connecting beam. The multiple steel bent frames and the steel columns are fixedly connected with steel structure bent frame column foot bolts embedded in bedrock or mass concrete on the lower portion of a hydropower station plant, the multiple steel columns are fixedly connected to the lower ends of the two steel crane beams through bolts, and one sides of the multiple steel columns fixedly connected with one steel crane beam are fixedly welded to one ends of the multiple steel connecting beams. The problems that in the technical field of hydropower engineering application, in the construction process of upper structure reinforced concrete of a traditional hydropower station ground workshop, the construction efficiency is low, and investment is large are solved.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower engineering application, and in particular to a hydropower station ground plant superstructure and an installation method. Background Art

[0002] As the most important building of a hydropower station, the ground powerhouse has multiple functional divisions, complex structural types, large volume, high technical requirements, and complicated structural design. The reasonable layout and design of the ground powerhouse plays a vital role in ensuring the quality of the project, optimizing the structural layout, fast construction, significantly shortening the construction period, speeding up the installation of units, saving investment, and ensuring the safe operation of the hydropower station.

[0003] The ground powerhouse of a hydropower station is generally a cast-in-place reinforced concrete structure, which is divided into the main powerhouse and the auxiliary powerhouse according to its function. The upper enclosure structure of the powerhouse is generally made of brick walls, but some also use concrete walls. The upper structure of the ground powerhouse of some hydropower stations adopts a prefabricated assembled structure, and the auxiliary powerhouse is mostly a mixed structure.

[0004] The following problems exist in the reinforced concrete construction of the upper structure of the ground powerhouse of traditional hydropower stations: (1) Temperature cracks: Since concrete generates hydration heat during the hardening process, especially in large-volume concrete, the temperature difference between the inside and outside may cause cracks on the concrete surface. Such cracks not only affect the appearance, but may also affect the durability and safety of the structure; (2) Uneven concrete pouring: During the concrete pouring process, if the vibration is insufficient or uneven, it may cause voids or honeycomb defects inside the concrete, affecting the overall strength and stability of the structure; (3) Construction environment factors: Extreme weather conditions such as excessive wind speed, high or low temperature, etc. may have an adverse effect on concrete pouring and maintenance, increasing the difficulty of construction; (4) Low construction efficiency. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, provide a hydropower station ground plant superstructure, and solve the technical problems in the field of hydropower engineering application technology caused by temperature cracks, uneven concrete pouring, large construction environment factors and low construction efficiency during steel structure concrete construction.

[0006] In order to achieve the above technical objectives, the technical solution of the present invention provides a hydropower station ground powerhouse upper structure and installation method, including:

[0007] Steel structure roof system, steel structure crane beam and steel structure bent frame; the steel structure roof system includes steel roof panel and steel grid; the steel roof panel is fixedly connected to the steel grid by screws; the steel structure crane beam includes steel crane beam and steel reinforcement plate; the steel reinforcement plate is welded and fixed to the steel crane beam to strengthen the bearing capacity of the steel crane beam; the steel structure bent frame includes steel bent frame, steel column and steel connecting beam; a plurality of the steel bent frames and the steel columns are fixedly connected with the steel structure bent frame column foot bolts buried in the bedrock or mass concrete of the lower part of the hydropower station plant; a plurality of the steel columns are fixedly connected with the lower end bolts of two steel crane beams; one side of the plurality of the steel columns fixedly connected to one of the steel crane beams is welded and fixed to one end of the plurality of the steel connecting beams; the other end of the plurality of the steel connecting beams is fixedly connected to the top of the plurality of the steel bent frames; two rows of the steel columns form the outer wall steel frame of the main plant; a row of the steel bent frames and an adjacent row of the steel columns form the outer wall steel frame of the downstream auxiliary plant.

[0008] Compared with the prior art, the beneficial effects of the present invention include:

[0009] (1) High construction efficiency: The upper structure of the ground powerhouse of the hydropower station provided by the invention adopts a steel structure roof system, a steel structure crane beam and a steel structure frame. The structure can be designed in a modular way, and some structures are welded in advance, which greatly simplifies the construction process and improves the construction efficiency.

[0010] (2) Lower investment: The upper structure of the ground powerhouse of the hydropower station provided by the invention adopts a steel structure roof system, a steel structure crane beam and a steel structure frame, which solves the problem of large investment in reinforced concrete construction of the upper structure of the ground powerhouse of a traditional hydropower station.

[0011] (3) Rationalization of bridge crane resources: The upper structure of the ground powerhouse of the hydropower station provided by the invention can be put into bridging in the middle of the construction period, which advances the operation time of the bridge crane and allows it to be used in the early stage of construction, greatly improving the utilization rate of the bridge crane and making resources more rational. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the longitudinal section structure of the upper structure of the ground powerhouse of the hydropower station provided by the present invention;

[0013] Figure 2 It is a schematic diagram of the plan structure of the upper structure of the ground powerhouse of the hydropower station provided by the present invention;

[0014] Figure 3 It is a cross-sectional structural schematic diagram of the upper structure of the ground powerhouse of the hydropower station provided by the present invention;

[0015] Figure 4 It is a schematic diagram of the connection between the steel crane beam and the steel bent frame provided by the present invention;

[0016] Figure 5The schematic diagram of the connection between the steel bent frame and the steel connecting beam provided by the present invention is Figure 1 ;

[0017] Figure 6 It is a schematic diagram of the connection between the steel roof panel and the steel grid provided by the present invention;

[0018] Figure 7 It is a schematic diagram of the internal structure of the corrugated metal plate composite wall provided by the present invention;

[0019] Figure 8 It is a schematic diagram of the connection of the steel diagonal brace provided by the present invention;

[0020] Fig. 9 It is a schematic diagram of the connection between the steel column and the steel connecting beam provided by the present invention;

[0021] Fig.10 The schematic diagram of the connection between the steel bent frame and the steel connecting beam provided by the present invention is Figure 2 .

[0022] The numbers in the figure are: 1-steel frame; 2-steel crane beam; 3-steel diagonal brace; 4-steel grid; 5-steel roof panel; 6-corrugated metal plate composite wall; 7-steel connecting beam; 8-main factory building; 9-first connecting plate; 10-second connecting plate; 11-steel column; 12-auxiliary factory building; 13-outer color steel plate; 14-breathable layer; 15-thermal insulation gasket; 16-high-density rock wool board; 17-inner color steel plate; 18-wall beam; 19-steel support; 20-steel reinforcement plate; 21-steel high-strength bolt; 22-steel crane beam support. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 This embodiment provides a hydropower station ground powerhouse upper structure, including: a steel structure roof system, a steel structure crane beam and a steel structure bent frame.

[0027] Furthermore, the steel structure roof system includes a steel roof panel 5 and a steel grid 4, and the steel roof panel 5 is fixedly connected to the steel grid 4 by screws.

[0028] Preferably, in the present embodiment, the steel roof panel 5 is made of galvanized steel plate, color-coated steel plate or other corrosion-resistant materials, which not only has good waterproof performance, but also can provide a certain thermal insulation effect, and at the same time has strong weather resistance and long service life. The steel roof panel 5 used in the present embodiment mainly has the following characteristics: 1. Lightweight and high strength: The steel roof panel is light in weight but high in strength, which can effectively reduce the overall load of the building and is suitable for various types of building structures; 2. Easy to install: Most steel roof panels are designed with a special connection system, such as snap-fit ​​or bite-fit, which can be quickly installed and greatly shorten the construction period; 3. Strong corrosion resistance: The specially treated steel roof panel has good corrosion resistance and can be used for a long time under harsh environmental conditions.

[0029] Furthermore, in the present embodiment, the steel grid 4 refers to a space frame structure made of steel, which is usually connected by steel pipes or other shaped steels through specific nodes to form a stable three-dimensional space structure system. The steel grid has the following advantages in the present embodiment: 1. Lightweight: The weight of the steel grid structure is much lighter than that of the traditional concrete structure, which helps to reduce the foundation burden and foundation pressure of the building; 2. High strength: Steel has high strength and can withstand large loads, which enhances the seismic resistance and durability of the building; 3. Convenient construction: The components of the steel grid structure can be prefabricated in the factory and then transported to the construction site for rapid assembly, which greatly shortens the construction period; 4. Corrosion resistance and durability: Through proper anti-corrosion treatment, the steel grid structure can have a longer service life.

[0030] Furthermore, the steel structure crane beam includes a steel crane beam 2 and a steel reinforcement plate 20 , and the steel reinforcement plate 20 is welded and fixed to the steel crane beam 2 to enhance the bearing capacity of the steel crane beam 2 .

[0031] Preferably, the material used for the steel crane beam 2 meets the relevant standards, such as Q235, Q345, etc., and its strength and toughness must be verified by mechanical property tests, wherein the design and manufacture of the steel crane beam must meet a series of strict requirements to ensure the safety and reliability of the crane operation. The following are the main requirements that the steel crane beam should meet: 1. Strength requirements, the steel crane beam must be able to withstand the maximum lifting weight and dynamic load of the crane to ensure that no damage occurs under the most unfavorable working conditions; 2. Stiffness requirements, the deflection of the crane beam under the maximum load should be controlled within the allowable range, usually 1 / 700 of the span or less, to ensure the stability and safety of the crane operation; the cross-sectional size and shape of the crane beam should ensure sufficient bending stiffness to prevent excessive deformation. 3. Stability requirements, the crane beam should not be unstable when subjected to lateral force and torque. 4. Fatigue strength requirements, according to the working level of the crane, the crane beam should have sufficient fatigue life and be able to withstand repeated loading without fatigue damage.

[0032] Furthermore, the steel reinforcement plate is welded to the steel crane beam to ensure that the web and flange of the steel crane beam have sufficient thickness and stiffening ribs to prevent local buckling and meet the local stability of the steel crane beam.

[0033] Furthermore, the steel structure frame includes a steel frame 1, a steel column 11 and a steel connecting beam 7, and a plurality of the steel frames 1 and the steel columns 11 are fixedly connected with steel structure frame column foot bolts buried in the bedrock or mass concrete at the bottom of the hydropower station building.

[0034] Specifically, the steel grid 4 is fixed to the upper end of the steel column 11 through a steel support 19 .

[0035] Preferably, in this embodiment, the steel bent frame 1 and the steel connecting beam 7 are both selected to be I-shaped steel on the market, but there is a difference in size between the two, and the size of the steel bent frame 1 is larger than the size of the steel connecting beam.

[0036] Preferably, in this embodiment, the steel column 11 is selected to be a hollow square steel tube available on the market.

[0037] Furthermore, the lower ends of the two steel crane beams 2 are bolted and fixed with a plurality of the steel columns 11, one side of the plurality of the steel columns 11 fixedly connected to one of the steel crane beams 2 is welded and fixed to one end of the plurality of the steel connecting beams 7, and the other ends of the plurality of the steel connecting beams 7 are fixedly connected to the top ends of the plurality of the steel frames 1; two rows of the steel columns 11 form the outer wall steel frame of the main factory building 8; a row of the steel frames 1 and an adjacent row of the steel columns 11 form the outer wall steel frame of the auxiliary factory building 12.

[0038] Specifically, a plurality of the steel columns 11 are arranged in a linear array to support the steel crane beam 2 .

[0039] Furthermore, when the steel crane beam 2 is installed on the steel column 11, the bridge crane can be put into use at this time, which advances the operation time of the bridge crane and can be used in the early stage of construction, greatly improving the utilization rate of the bridge crane and making resources more rational.

[0040] Furthermore, a plurality of the steel frames 1 are provided at both ends of the two rows of the steel columns 11 , and a plurality of the steel connecting beams 7 are welded between the plurality of the steel frames 1 .

[0041] Furthermore, two adjacent steel columns 11 are welded and fixed with two steel diagonal braces 3 , and two adjacent steel bent frames 1 are welded and fixed with two steel diagonal braces 3 , and the two steel diagonal braces 3 are cross-welded and fixed.

[0042] Specifically, in the present embodiment, the main purpose of welding the steel diagonal brace 3 between two adjacent steel columns 11 is to enhance the stability and rigidity of the structure, which has the following effects: 1. Improving the stability of the structure: the steel diagonal brace can effectively resist the lateral displacement caused by lateral loads (such as wind loads, earthquake loads, etc.), and the steel diagonal brace can prevent the structure from twisting when subjected to asymmetric loads, thereby maintaining the geometric shape of the structure unchanged; 2. By adding steel diagonal braces, the deflection of the steel column under the action of lateral loads can be significantly reduced, and the rigidity of the structure can be improved. The steel diagonal brace can share part of the bending moment, reduce the bending stress of the steel column, and improve the bending resistance of the overall structure; 3. The steel diagonal brace can evenly distribute the load to each component, avoid local stress concentration, and improve the overall bearing capacity of the structure. Multiple steel diagonal braces can work together to share the load, making the structure more balanced and stable.

[0043] Furthermore, two rows of the steel columns 11 and one row of the steel bent frames 1 are fixedly connected on both sides with a corrugated metal sheet composite wall 6, and the corrugated metal sheet composite wall 6 includes an outer color steel plate 13, an inner color steel plate 17, an insulating gasket 15, a high-density rock wool board 16 and a wall beam 18.

[0044] Furthermore, the outer color steel plate 13 and the inner color steel plate 17 are arranged in parallel, and a plurality of wall beams 18 are fixedly connected in an array between the outer color steel plate 13 and the inner color steel plate 17, one side of the wall beam 18 is fixedly connected to the inner color steel plate 17 by screws, wherein the thermal insulation gasket 15 is fixedly connected between the wall beam 18 and the inner color steel plate 17, and the other side of the wall beam 18 is fixedly connected to the outer color steel plate 13 by screws, wherein the thermal insulation gasket 15, the high-density rock wool board 16 and the breathable layer 14 are fixedly connected between the wall beam 18 and the outer color steel plate 13 in sequence.

[0045] Furthermore, in this embodiment, the air permeable layer 14 can be made of air permeable paper-faced gypsum board, non-woven fabric, etc. in the prior art.

[0046] Furthermore, the air permeable layer 14 in the profiled metal sheet composite is generally a waterproof breathable membrane, which is a material that allows water vapor to pass through but prevents liquid water from penetrating. The function of this membrane is to prevent moisture from accumulating inside the building envelope, thereby avoiding the problem of condensation and mold growth inside the structure.

[0047] Specifically, the breathable layer is generally made of a high molecular polymer and has a microporous structure, which is small enough to prevent the passage of liquid water but large enough to allow water vapor molecules to pass through. This material can effectively regulate the humidity balance inside and outside the building envelope while maintaining the waterproof performance of the building.

[0048] Furthermore, the corrugated metal plate composite wall 6 in this embodiment has the following advantages: (1) Lightweight and high strength: The total weight is light, which can effectively reduce the foundation burden of the building and reduce the foundation treatment cost. It has high strength and rigidity and can withstand large loads. (2) The internal filling insulation material (such as rock wool, polystyrene foam, etc.) has good thermal insulation performance, which can effectively reduce the temperature difference between indoor and outdoor, reduce energy consumption, effectively isolate external heat, maintain indoor temperature stability, and improve living comfort. (3) Strong corrosion resistance: After galvanizing or coating treatment, it has strong corrosion resistance and is suitable for use in various environmental conditions. It has good durability and long service life, reducing maintenance and replacement costs. (4) Convenient construction: It is pre-processed into standard parts in the factory and quickly assembled after being transported to the site, which greatly shortens the construction period. The modular structural design makes the installation process simpler and improves construction efficiency.

[0049] Furthermore, the steel crane beam 2 is fixedly connected to the steel frame 1 through a crane beam support 22, and the crane beam support 22 is fixedly connected to the steel frame 1. The crane beam support 22 is trapezoidal in shape, and the steel crane beam 2 is placed at the upper end of the crane beam support 22. The steel crane beam 2 is in an I-shape, and the lower base plate of the steel crane beam 2 is detachably fixedly connected to the crane beam support 22 by bolts, wherein the upper end surface of the steel crane beam 2 is welded and fixedly connected to one side of the steel frame 1 by a first connecting plate 9; the first connecting plate 9 is L-shaped.

[0050] Specifically, the crane beam support 22 supports the steel crane beam 2 .

[0051] Furthermore, a plurality of the steel reinforcement plates 20 are provided between the lower end surface of the steel crane beam 2 and the upper end surface of the crane beam support 22 to improve the load-bearing capacity of the crane beam support 22 .

[0052] Specifically, the first connecting plate 9 is used to improve the rigidity and strength of the steel bent frame 1 .

[0053] Furthermore, the end face of the steel connecting beam 7 is welded and fixed to one side of the steel frame 1, and steel reinforcement plates 20 are welded and fixed on both sides of the welding point between the steel connecting beam 7 and the steel frame 1, one side of the steel reinforcement plate 20 is welded and fixed to one side of the steel connecting beam 7, and the other side of the steel reinforcement plate 20 is welded and fixed to one side of the steel frame 1.

[0054] Furthermore, the welding point between the steel connecting beam 7 and the steel bent frame 1 is fixedly connected with a plurality of the steel reinforcing plates 20 by means of steel high-strength bolts 21 , and the end faces of the plurality of the steel reinforcing plates 20 are welded and fixed to one side of the steel bent frame 1 .

[0055] Specifically, the steel reinforcement plate 20 is used to improve the bearing capacity, rigidity and stability of the steel connecting beam 7 and the steel bent frame 1 .

[0056] Furthermore, the steel diagonal brace 3 is fixedly connected to the steel frame 1 and the steel connecting beam 7 through a second connecting plate 10. The second connecting plate 10 is welded and fixed to both ends of the steel diagonal brace 3. One end face of the second connecting plate 10 is welded and fixed to one side of the steel connecting beam 7, and the other end face of the second connecting plate 10 is welded and fixed to one side of the steel frame 1.

[0057] Preferably, in this embodiment, the two cross-arranged steel diagonal braces 3 are welded in advance to improve the overall construction efficiency and reduce the working hours.

[0058] Furthermore, in this embodiment, the second connecting plate 10 is used to improve the bearing capacity, rigidity and stability of the steel connecting beam 7 and the steel bent frame 1 .

[0059] Furthermore, the steel column 11 is welded and fixed to the steel connecting beam 7, one end face of the steel connecting beam 7 is welded and fixed to one side of the steel column 11, and the welding point between the steel connecting beam 7 and the steel column 11 is fixedly connected with a plurality of the steel reinforcement plates 20 by the steel high-strength bolts 21, and the end faces of the plurality of the steel reinforcement plates 20 are welded and fixed to one side of the steel column 11.

[0060] Specifically, the plurality of high-strength steel bolts 21 and the plurality of steel reinforcement plates 20 are used to strengthen the bearing capacity, rigidity and stability of the steel connecting beam 7 and the steel column 11 .

[0061] In this embodiment, a step of installing the upper structure of the ground powerhouse of a hydropower station is also provided, as follows:

[0062] S1, fixing and installing the plurality of the steel bent frames 1 and the steel columns 11 to the steel structure bent frame column foot bolts buried in the bedrock or mass concrete at the bottom of the hydropower station building;

[0063] S2, installing the steel connecting beam 7 between the adjacent steel columns 11 and the adjacent steel bent frames 1;

[0064] S3, installing the steel crane beam 2 on the crane beam supports 22 of the plurality of steel columns 11;

[0065] S4, installing the steel grid 4 on the upper ends of the plurality of steel columns 11;

[0066] S5, installing the steel roof panel 5 on the upper end of the steel grid 4;

[0067] S6. Install the corrugated metal sheet composite wall 6 on both sides of two adjacent rows of the steel columns 11 and one row of the steel bent frames 1.

[0068] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hydropower station ground powerhouse superstructure, characterized in that: include: Steel structure roof system, steel structure crane beam and steel structure bent frame; The steel structure roof system includes a steel roof panel and a steel grid; the steel roof panel is fixedly connected to the steel grid by screws; the steel structure crane beam includes a steel crane beam and a steel reinforcement plate; the steel reinforcement plate is welded and fixed to the steel crane beam to enhance the bearing capacity of the steel crane beam; the steel structure bent frame includes a steel bent frame, a steel column and a steel connecting beam; a plurality of the steel bent frames and the steel columns are fixedly connected with the steel structure bent frame column foot bolts buried in the bedrock or mass concrete at the lower part of the hydropower station plant; a plurality of the steel columns are fixedly connected with the lower end bolts of two steel crane beams; one side of the plurality of the steel columns fixedly connected to one of the steel crane beams is welded and fixed to one end of the plurality of the steel connecting beams; the other end of the plurality of the steel connecting beams is fixedly connected to the top of the plurality of the steel bent frames; two rows of the steel columns form the outer wall steel frame of the main plant; a row of the steel bent frames and an adjacent row of the steel columns form the outer wall steel frame of the auxiliary plant.

2. The hydropower station ground powerhouse superstructure according to claim 1, characterized in that: Multiple steel frames are arranged at both ends of the two rows of steel columns; multiple steel connecting beams are welded between the multiple steel frames; two adjacent steel columns are welded and fixed with two steel diagonal braces; two adjacent steel frames are welded and fixed with two steel diagonal braces; the two steel diagonal braces are cross-welded and fixed.

3. The hydropower station ground powerhouse superstructure according to claim 2, characterized in that: The two rows of steel columns and one row of steel racks are fixedly connected with corrugated metal plate composite walls on both sides; the corrugated metal plate composite wall comprises an outer color steel plate, an inner color steel plate, a heat insulation gasket, a high-density rock wool board and a wall beam.

4. The hydropower station ground powerhouse superstructure according to claim 3, characterized in that: The outer color steel plate and the inner color steel plate are arranged in parallel; a plurality of wall beams are fixedly connected in an array between the outer color steel plate and the inner color steel plate; one side of the wall beam is fixedly connected to the inner color steel plate by screws, wherein the thermal insulation gasket is fixedly connected between the wall beam and the inner color steel plate; the other side of the wall beam is fixedly connected to the outer color steel plate by screws, wherein the thermal insulation gasket, the high-density rock wool board and the breathable layer are fixedly connected between the wall beam and the outer color steel plate in sequence.

5. The hydropower station ground powerhouse superstructure according to claim 4, characterized in that: The steel crane beam is fixedly connected to the steel frame via a crane beam support; the crane beam support is fixedly connected to the steel frame; the crane beam support is trapezoidal in shape; the steel crane beam is placed at the upper end of the crane beam support; the steel crane beam is I-shaped; the lower base plate of the steel crane beam is detachably fixedly connected to the crane beam support via bolts, wherein the upper end face of the steel crane beam is welded and fixedly connected to one side of the steel frame via a first connecting plate; the first connecting plate is L-shaped.

6. The hydropower station ground powerhouse superstructure according to claim 5, characterized in that: The end face of the steel connecting beam is welded and fixed to one side of the steel bent frame; steel reinforcing plates are welded and fixed to both sides of the welding point between the steel connecting beam and the steel bent frame; one side of the steel reinforcing plate is welded and fixed to one side of the steel connecting beam; the other side of the steel reinforcing plate is welded and fixed to one side of the steel bent frame.

7. The hydropower station ground powerhouse superstructure according to claim 6, characterized in that: A plurality of the steel reinforcing plates are fixedly connected at the welding point between the steel connecting beam and the steel bent frame by means of steel high-strength bolts; and the end faces of the plurality of the steel reinforcing plates are welded and fixed to one side of the steel bent frame.

8. The hydropower station ground powerhouse superstructure according to claim 7, characterized in that: The steel diagonal brace is fixedly connected to the steel frame and the steel connecting beam through a second connecting plate; the first connecting plate is welded and fixed to both ends of the steel diagonal brace; one end surface of the second connecting plate is welded and fixed to one side of the steel connecting beam; the other end surface of the second connecting plate is welded and fixed to one side of the steel frame.

9. The hydropower station ground powerhouse superstructure according to claim 8, characterized in that: The steel column is fixed to the steel connecting beam by welding; one end face of the steel connecting beam is fixed to one side of the steel column by welding; a plurality of steel reinforcement plates are fixedly connected to the welding point between the steel connecting beam and the steel column by steel high-strength bolts; the end faces of the plurality of steel reinforcement plates are fixed to one side of the steel column by welding.

10. A method for installing a hydropower station ground powerhouse upper structure, using the hydropower station ground powerhouse upper structure as claimed in claims 1 to 9, comprising the following steps: S1. Fixing and installing the plurality of steel bent frames and the steel columns to the steel structure bent frame column foot bolts buried in the bedrock or mass concrete at the bottom of the hydropower station building; S2, installing the steel connecting beams between adjacent steel columns and adjacent steel bent frames; S3, installing the steel crane beam on the crane beam supports of the plurality of steel columns; S4, installing the steel grid on the upper ends of the plurality of steel columns; S5, installing the steel roof panel on the upper end of the steel grid; S6. Install the corrugated metal sheet composite wall on both sides of two adjacent rows of the steel columns and one row of the steel bent frames.

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