Installation and construction method for fairing cone of vertical shaft type water inlet and outlet of pumped storage power station

Abstract

The invention relates to a pumped storage power station vertical shaft type water inlet and outlet fairing cone installation construction method, which comprises the following steps of: hoisting a hoisting steel truss type steel platform to the position of a vertical shaft type water inlet and outlet through a truck crane, supporting the hoisting steel truss type steel platform on a top edge step of the water inlet and outlet, adjusting the position of the platform, and installing and fixing the platform; a supporting steel pipe is arranged in the center above the hoisting steel truss type steel platform, and the inner diameter of the supporting steel pipe is smaller than the diameter of the cone end spherical surface of the fairing cone steel lining; the lower half part of the fairing cone steel lining is hoisted to the position of a vertical shaft type water inlet and outlet through a truck crane, and the cone end spherical surface of the fairing cone steel lining is supported on a supporting steel pipe on a lower hoisting steel truss type steel platform and is supported through a steel pipe formwork support; the upper half part of the fairing cone steel lining is hoisted to the position of the vertical shaft type water inlet and outlet through a truck crane and supported through a steel pipe formwork support, and the upper half part of the fairing cone steel lining and the lower half part of the fairing cone steel lining are welded to form the fairing cone steel lining; and concrete pouring construction of the fairing cone is carried out by taking the fairing cone steel lining as a pouring template.

Description

Technical Field

[0001] The invention relates to a method for installing and constructing a rectifier cone of a vertical shaft water inlet and outlet of a pumped storage power station, and is applicable to the field of water conservancy and hydropower engineering. Background Art

[0002] The vertical shaft water inlet of the upper reservoir of the pumped storage power station consists of the top cover, the diversion pier shaft diffusion section, the shaft straight pipe section, the shaft bend section, the upstream flat tunnel of the accident gate shaft, the accident gate shaft and the gradient section. The top cover of the shaft is an equi-octagonal plane, and the lower surface is a conical rectifying cone, which is divided into eight holes by eight middle piers and arranged horizontally radially.

[0003] Due to the limitations of the shaft-type water inlet itself, the inlet and outlet diffusion effect and flow pattern are poor. In order to reduce the head loss, a top plate and a straightening cone are installed. However, there are several difficulties in construction: the weight of the concrete under the top cover and the straightening cone steel lining is about 500t, and the support in the straightening cone construction is more difficult; in the vertical orifice, the steel mold of the straightening cone part must be finely adjusted to ensure that the steel mold of the cone tip is close to vertical. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the above-mentioned existing problems, a method for installing and constructing straightening cones of vertical shaft-type water inlets and outlets of a pumped-storage power station is provided.

[0005] The technical solution adopted by the present invention is: a method for installing and constructing a rectifier cone of a vertical shaft water inlet and outlet of a pumped storage power station, characterized in that it comprises:

[0006] Use a truck crane to hoist the steel truss steel platform to the position of the vertical shaft water inlet and outlet, and support it on the top edge step of the water inlet and outlet, adjust the platform position and install and fix the platform;

[0007] A supporting steel pipe is arranged at the center position above the suspended steel truss steel platform, and the inner diameter of the supporting steel pipe is smaller than the diameter of the spherical surface of the cone end of the rectifier cone steel liner;

[0008] The lower half of the rectifier cone steel lining is hoisted to the position of the vertical shaft water inlet and outlet by a truck crane, and the spherical surface of the cone end of the rectifier cone steel lining is supported on the supporting steel pipe on the steel truss steel platform below, and supported by a steel pipe formwork frame;

[0009] The upper part of the rectifier cone steel lining is hoisted to the position of the vertical shaft water inlet and outlet by a truck crane, supported by a steel pipe formwork frame, and the upper part of the rectifier cone steel lining is welded to the lower part of the rectifier cone steel lining to form a rectifier cone steel lining;

[0010] The concrete pouring construction of the rectifier cone is carried out using the rectifier cone steel lining as the pouring template;

[0011] The suspended steel truss steel platform has a main load-bearing truss, a connecting truss and a steel strand, wherein the main load-bearing truss has a plurality of main truss beams corresponding to the water inlets and outlets between the diversion piers, the plurality of main truss beams are evenly distributed radially with the middle connecting piece as the center, and adjacent main truss beams are connected via the connecting truss;

[0012] There are a plurality of steel strands which are evenly distributed around the center of the suspension steel truss steel platform. One end of the steel strand is connected to the middle area of ​​the main load-bearing truss, and the other end of the pulley block is fixed to the winch next to the diversion pier.

[0013] Concrete is poured into the supporting steel pipe.

[0014] The suspended steel truss steel platform is provided with a steel pipe formwork frame for supporting the load during concrete pouring, and the steel pipe formwork frame is erected by a radial bracket erection method.

[0015] The upper half of the rectifier cone steel lining is formed by circumferentially splicing a number of tiles.

[0016] A plurality of angle steels for supporting and reinforcing are arranged between the hanging steel truss steel platform and the lower half of the rectifier cone steel lining.

[0017] After the concrete of the rectifier cone reaches the designed strength, the steel pipe formwork and the suspended steel truss steel platform are dismantled, including:

[0018] Removal of the steel pipe formwork on the suspended steel truss steel platform used to support the load during concrete pouring;

[0019] Remove the steel strands on the steel truss platform;

[0020] Dismantle the connecting trusses on the steel truss steel platform;

[0021] The main load-bearing truss is dismantled, and the main truss beams on the main load-bearing truss are symmetrically dismantled on both sides with the center of the main load-bearing truss as the boundary. During the dismantling process, the rectifier cone steel lining is used as a hanging point.

[0022] Use cantilevered rotatable convenient disassembly and assembly lifting equipment to assist in the dismantling of the steel pipe formwork and the suspended steel truss steel platform;

[0023] The cantilever rotatable convenient disassembly and assembly lifting device comprises:

[0024] Electric hoist track;

[0025] A first gantry is arranged at the first end of the electric hoist track, and a counterweight is provided on the first gantry;

[0026] A second gantry is arranged in the middle of the electric hoist track;

[0027] A rotating mechanism is arranged between the electric hoist track and the first gantry, so that the electric hoist track can realize horizontal rotation around the rotating mechanism;

[0028] An electric hoist is installed on the electric hoist track;

[0029] The lifting carriage is installed on the electric hoist track.

[0030] The electric hoist and the lifting carriage are connected by a connecting rod.

[0031] The beneficial effect of the present invention is that the present invention sets a lifting steel truss steel platform, so that the platform can be hoisted to the position of the shaft-type water inlet and outlet by a car crane, so as to quickly form a construction platform at the position of the shaft-type water inlet and outlet, thereby improving construction efficiency.

[0032] The main load-bearing truss of the lifting steel truss steel platform in the present invention has a plurality of main truss beams corresponding to the water inlets and outlets between the diversion piers, thereby avoiding positional interference between the lifting steel truss steel platform and the diversion pier, and facilitating the lifting operation of the lifting steel truss steel platform.

[0033] In the present invention, a supporting steel pipe is arranged at the center position above the suspended steel truss steel platform, and the spherical surface of the cone end of the rectifier cone steel liner is supported by the supporting steel pipe, so that the rectifier cone steel liner can be easily adjusted and installed.

[0034] In the present invention, the steel strand is used to control the suspended steel truss steel platform, and cooperates with the automobile crane to ensure the verticality and posture of the installation of the cone tip part of the suspended steel truss steel platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the vertical shaft water inlet and outlet structure in the embodiment.

[0036] Figure 2 It is a schematic diagram of the structure of the suspended steel truss steel platform in the embodiment.

[0037] Figure 3 It is a three-dimensional diagram of the suspended steel truss steel platform in the embodiment.

[0038] Figure 4 It is a schematic diagram of the hoisting of the suspended steel truss steel platform in the embodiment.

[0039] Figure 5 It is a schematic diagram of the structure after the lower half of the rectifier cone steel liner in the embodiment is hoisted.

[0040] Figure 6 It is a schematic diagram of the hoisting of the upper half of the rectifier cone steel liner in the embodiment.

[0041] Figure 7 Schematic diagram of the steel pipe formwork in the embodiment.

[0042] Figure 8 It is a structural schematic diagram of a cantilever rotatable convenient disassembly and assembly lifting device in an embodiment.

[0043] 1. Suspension steel truss steel platform; 101. Steel strand; 102. Main truss beam; 103. Connection truss;

[0044] 2. Steel pipe formwork;

[0045] 3. Support steel pipe;

[0046] 4. Diversion pier;

[0047] 5. Rectifier cone steel lining; 501. Lower half of the rectifier cone steel lining; 502. Upper half of the rectifier cone steel lining;

[0048] 6. Angle steel;

[0049] 7. Electric hoist track;

[0050] 8. First door frame;

[0051] 9. Second door frame;

[0052] 10. Electric hoist;

[0053] 11. Lifting sports car;

[0054] 12. Counterweight. DETAILED DESCRIPTION

[0055] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0056] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0057] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0058] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0059] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0060] Embodiment 1: In this embodiment, the structural concrete of the vertical shaft type water inlet and outlet is constructed in layers and compartments. The overall construction sequence of the vertical shaft type water inlet and outlet is: backfill concrete construction of the foundation below EL625.0, pouring of concrete of EL625.0 to EL626.4 for the foundation of the trash rack embedded plate (first compartment), pouring of concrete of EL626.4 to EL628.0 for the foundation of the diverter pier (second compartment), pouring of concrete of EL628.0 to EL631.7 for the diverter pier (third compartment), pouring of concrete of EL626.665 to EL632.7 for the rectifying cone (fourth compartment), pouring of concrete of EL632.7 to EL633.7 for the cross beam of the top cover (fifth compartment), backfilling and pouring of concrete of EL625.0 to EL628.0 reserved for the wellhead (sixth compartment).

[0061] This embodiment is a method for installing a straightening cone at a vertical shaft inlet and outlet of a pumped storage power station. The method is performed after the casting of the diversion pier (third bin) is completed, and specifically includes the following steps:

[0062] S100. Use a truck crane to hoist the steel truss steel platform to the position of the vertical shaft water inlet and outlet, and support it on the top edge step of the water inlet and outlet (the area for subsequent pouring of the sixth bin concrete), adjust the platform position, and install and fix the platform.

[0063] In this embodiment, the suspended steel truss steel platform has a main load-bearing truss, a connecting truss and steel strands, wherein the main load-bearing truss has a plurality of main truss beams corresponding one by one to the water inlets and outlets between the diversion piers, and the plurality of main truss beams are evenly distributed radially with the middle connecting piece as the center, and adjacent main truss beams are connected via a plurality of connecting trusses.

[0064] In this example, there are a number of steel strands evenly distributed around the center of the suspension steel truss steel platform. One end of the steel strand is connected to the middle area of ​​the main load-bearing truss, and the other end of the pulley block is fixed to the winch next to the diversion pier.

[0065] In this embodiment, a supporting steel pipe is arranged at the center position above the suspended steel truss steel platform. The inner diameter of the supporting steel pipe is smaller than the diameter of the spherical surface at the cone end of the rectifier cone steel liner, and concrete is poured in the supporting steel pipe.

[0066] S200. Use a truck crane to hoist the lower half of the rectifier cone steel lining to the position of the vertical shaft water inlet and outlet, and support the spherical surface of the cone end of the rectifier cone steel lining on the supporting steel pipe on the hanging steel truss steel platform below. A number of angle steels for support and reinforcement are provided between the hanging steel truss steel platform and the lower half of the rectifier cone steel lining.

[0067] In this embodiment, the supporting steel pipe is used to facilitate the adjustment of the verticality and posture of the lower half of the rectifier cone steel lining. At the same time, the steel wire winch is used to control the platform and cooperate with the automobile crane to ensure the verticality and posture of the cone tip part of the lower half of the rectifier cone steel lining.

[0068] S300. Use a car crane to hoist the upper half of the rectifier cone steel lining to the position of the vertical shaft water inlet and outlet, and weld the upper half of the rectifier cone steel lining and the lower half of the rectifier cone steel lining to form a rectifier cone steel lining, wherein the upper half of the rectifier cone steel lining is formed by circumferentially splicing a number of tiles.

[0069] S400, using the steel lining of the rectifier cone as the casting template to carry out the concrete pouring construction of the rectifier cone, corresponding to the fourth and fifth bins.

[0070] In this embodiment, a disc-type steel pipe formwork frame is erected on the suspended steel truss steel platform, and a radial bracket erection method is adopted. The radial direction meets the disc-type frame erection module, and the circumferential direction uses a disc-type frame horizontal short rod and the vertical rod connected by fasteners to support the load during concrete pouring.

[0071] S500. After the concrete of the rectifier cone reaches the designed strength, the steel pipe formwork and the suspended steel truss steel platform will be dismantled.

[0072] S510, dismantle the steel pipe formwork on the suspended steel truss steel platform used to support the load during concrete pouring;

[0073] S520, dismantle the steel strands on the steel truss platform;

[0074] S530, dismantle the connecting trusses on the steel truss steel platform;

[0075] S540, dismantle the main load-bearing truss, take the center of the main load-bearing truss as the boundary, and symmetrically dismantle the main truss beams on the main load-bearing truss on both sides. During the dismantling process, use the rectifier cone steel lining as a hanging point and cooperate with a hand winch to carry out the dismantling.

[0076] In this embodiment, a cantilever rotatable convenient disassembly and assembly lifting device is used to assist in dismantling the steel pipe formwork frame and the lifting steel truss steel platform. The cantilever rotatable convenient disassembly and assembly lifting device includes: an electric hoist track, a first gantry, a second gantry, a rotating mechanism, an electric hoist, and a lifting carriage.

[0077] In this example, the electric hoist track is arranged horizontally, and the first end of the electric hoist track is supported by the first gantry and connected to the bottom surface. The first gantry is provided with a counterweight. The middle part of the electric hoist track is supported by the second gantry and connected to the ground. The electric hoist and the lifting carriage are installed on the electric hoist track. The electric hoist and the lifting carriage are connected by a connecting rod to ensure that the two are synchronized.

[0078] In this embodiment, the first gantry is connected to the electric hoist track via a rotating mechanism, and the electric hoist track can rotate horizontally around the rotating mechanism to expand the operation coverage of the cantilever rotatable convenient disassembly and assembly lifting equipment. The rotating mechanism has a rotating shaft and a bearing, and is equipped with a locking device for locking the relative position between the first gantry and the electric hoist track.

[0079] Embodiment 2: This embodiment is a specific instance of Embodiment 1. The supporting platform of the straightening cone of the shaft top cover adopts a combined supporting steel frame of a suspended steel truss platform + a disc-type steel pipe formwork frame. The base of the suspended steel truss steel platform is arranged at an elevation of EL625.0m. A concrete structure with a width of 68m is reserved around the wellhead for post-casting (the reserved width can be adjusted according to the on-site construction conditions), and a steel truss base with a width of 16.8m is welded to produce a steel truss base. The steel truss is composed of 4 groups of 4 1860-grade Φ15.24 steel strands that are passed through a pulley block and fixed to a winch next to the pier to adjust the supporting platform according to the stress conditions.

[0080] The weight of the concrete + steel plate acting on the cone of the rectifier cone supporting the truss system is about 500t. To ensure the effective support of the cone part, a Φ377×20 support steel pipe is set at the center of the steel platform of the suspension steel truss to support the cone tip of the rectifier cone. While installing the steel formwork of the cone tip of the rectifier cone, concrete is poured in the Φ377×20 steel pipe to ensure that the steel formwork of the cone tip is close to vertical. In this case, I12 I-beams are welded to the main load-bearing truss to form a hoop steel support. At the same time, the steel strand winch is used to control the platform and cooperate with the truck crane to ensure the verticality and posture of the steel formwork of the cone tip.

[0081] A radial support erection method is adopted in the rectifying cone area. The radial direction meets the erection modulus of the disc frame. The circumferential direction adopts the disc frame horizontal short rods and the vertical rods connected by fasteners. A 900×900mm disc frame is used in the rectifying cone cover area to support the load during concrete pouring.

[0082] Lifting steps of the steel truss platform: (1) Use a 200t truck crane to lift the steel truss platform → (2) The 200t truck crane slowly moves to the top of the diversion pier and rotates a certain angle so that it can avoid the diversion pier and directly enter the hole → (3) Lift it to the EL625m elevation platform. After lifting it into place, bolt or weld it to the embedded parts.

[0083] In this embodiment, the rectifier cone steel lining is installed in two parts, the lower part is manufactured and assembled by the manufacturing plant, and then transported to the installation site for direct hoisting and adjustment into place; the upper part is manufactured by the manufacturing plant and assembled into tiles for transport to the site because the transportation components are too wide.

[0084] Two sets of platforms are set up in the open space of the vertical shaft on site, one of which is an assembly platform, used to assemble tiles into a single-section cone; the other is an assembly platform, used to assemble the single-section assembled cones into a circle to form the upper half of the rectifier cone steel lining.

[0085] In this embodiment, a 25t truck crane is used for tile splicing, and a 200t truck crane is used for hoisting the rectifier cone to a circle and the upper part.

[0086] In this case, after the lower part of the straightening cone steel lining was spliced ​​in the manufacturing plant, its height was 2.5m and the maximum diameter was about 3.2m. It was transported to the site by a transport vehicle and installed in place with a 200t truck crane. The on-site personnel first adjusted the level, elevation and verticality of the lower part of the straightening cone; after the adjustment was completed, it was supported and reinforced with angle steel, and after the reinforcement was completed, a welding platform was set up.

[0087] According to construction requirements, the disc-type support frame under the straightening cone can only be removed after the concrete pouring of the straightening cone and 1m thick slab of the shaft top cover is completed and reaches the designed strength.

[0088] (1) After all the steel pipes of the full-floor scaffolding on the operating platform are removed, all safety nets are removed, and the upper and lower horizontal tie rods and scissor braces between all steel trusses are removed.

[0089] (2) Remove the connection between the I12 I-beam and the connecting truss, and gradually hoist the I12 I-beam to the ground at EL628.0m.

[0090] (3) After all I12 I-beams are removed, first remove the 16 Φ15.24 steel strands, and then remove the connecting trusses in sequence and pay attention to stacking them to facilitate the turnover of the top plate.

[0091] (4) The dismantling order of the connecting truss is from outside to inside. The connecting truss is gradually transported outward by setting a horizontal lifting pulley at the bottom of 2.5m, and then lifted to the ground by a car.

[0092] (5) After all the steel beams of the connecting trusses are removed, the main load-bearing trusses are gradually removed in the reverse order of installation. The main trusses are removed symmetrically on both sides with the center point of the trusses as the boundary. During the removal process, the cone outer steel formwork is used as the hanging point and the removal is carried out in conjunction with the hand winch. The main load-bearing trusses are also transported using a horizontal lifting pulley set at the bottom of 2.5m.

[0093] After the rectifier cone is installed and adjusted in this embodiment, the entire shaft opening is covered and blocked by the diversion piers on all sides, so the car crane cannot reach in for lifting. Therefore, a self-made cantilever rotatable convenient disassembly and assembly lifting equipment is used for auxiliary operations.

[0094] After the cantilever rotatable convenient disassembly and assembly lifting equipment is spliced ​​on the ground, use the car crane to lift the cantilever rotatable convenient disassembly and assembly lifting equipment to the inside of the diversion pier near the second gantry near the edge of the hole. In order to ensure the center of gravity of the lifting, first drive the electric hoist and the lifting car to the limit block of the first gantry. After adjusting the angle, control the electric hoist to lift. Before lifting, add counterweight to the first gantry, and the total counterweight should not be less than 3.6t.

[0095] After the installation of the rectifier cone is completed, it is directly erected on the diversion pier. First, remove the supporting angle steel and grind it; finally, remove the assembly welding in turn. Place the dismantled scaffolding and supporting platform on the edge of the diversion pier closer to the ground in turn, so that the cantilever lifting equipment can be used for lifting and removal. After all the supporting angle steel and assembly welding platforms on the steel truss platform are removed, use the cantilever rotatable convenient disassembly and assembly lifting equipment to lift them to the hole, move them to the outside of the diversion pier, and then use a car crane to lift them to the transport vehicle. Remove the connection between the I12 I-beam and the connecting truss, and gradually transport the I12 I-beam to the ground with a cantilever crane. After all the I12 I-beams are removed, first remove the 16 Φ15.24 steel strands on the winch.

Claims

1. A method for installing and constructing a rectifier cone at a vertical inlet and outlet of a pumped storage power station, characterized in that: include: Use a truck crane to hoist the steel truss steel platform to the position of the vertical shaft water inlet and outlet, and support it on the top edge step of the water inlet and outlet, adjust the platform position and install and fix the platform; A supporting steel pipe is arranged at the center position above the suspended steel truss steel platform, and the inner diameter of the supporting steel pipe is smaller than the diameter of the spherical surface of the cone end of the rectifier cone steel liner; Use a truck crane to hoist the lower half of the rectifier cone steel lining to the position of the vertical shaft inlet and outlet, and support the spherical surface of the cone end of the rectifier cone steel lining on the supporting steel pipe on the lower hanging steel truss steel platform; The upper part of the rectifier cone steel lining is hoisted to the position of the vertical shaft water inlet and outlet by a truck crane, and the upper part of the rectifier cone steel lining is welded with the lower part of the rectifier cone steel lining to form the rectifier cone steel lining; The concrete pouring construction of the rectifier cone is carried out using the rectifier cone steel lining as the pouring template; The suspended steel truss steel platform has a main load-bearing truss, a connecting truss and a steel strand, wherein the main load-bearing truss has a plurality of main truss beams corresponding to the water inlets and outlets between the diversion piers, the plurality of main truss beams are evenly distributed radially with the middle connecting piece as the center, and adjacent main truss beams are connected via the connecting truss; There are a plurality of steel strands which are evenly distributed around the center of the suspension steel truss steel platform. One end of the steel strand is connected to the middle area of ​​the main load-bearing truss, and the other end of the pulley block is fixed to the winch next to the diversion pier.

2. The method for installing and constructing a rectifier cone for a vertical inlet and outlet of a pumped storage power station according to claim 1, characterized in that: Concrete is poured into the supporting steel pipe.

3. The method for installing and constructing a rectifier cone for a vertical inlet and outlet of a pumped storage power station according to claim 1, characterized in that: The suspended steel truss steel platform is provided with a steel pipe formwork frame for supporting the load during concrete pouring, and the steel pipe formwork frame is erected by a radial bracket erection method.

4. The method for installing and constructing a rectifier cone for a vertical inlet and outlet of a pumped storage power station according to claim 1, characterized in that: The upper half of the rectifier cone steel lining is formed by circumferentially splicing a number of tiles.

5. The method for installing and constructing a rectifier cone for a vertical inlet and outlet of a pumped storage power station according to claim 1, characterized in that: A plurality of angle steels for supporting and reinforcing are arranged between the hanging steel truss steel platform and the lower half of the rectifier cone steel lining.

6. The method for installing and constructing a rectifier cone for a vertical inlet and outlet of a pumped storage power station according to claim 1, characterized in that: After the concrete of the rectifier cone reaches the designed strength, the steel pipe formwork and the suspended steel truss steel platform are dismantled, including: Removal of the steel pipe formwork on the suspended steel truss steel platform used to support the load during concrete pouring; Remove the steel strands on the steel truss platform; Dismantle the connecting trusses on the steel truss steel platform; The main load-bearing truss is dismantled, and the main truss beams on the main load-bearing truss are symmetrically dismantled on both sides with the center of the main load-bearing truss as the boundary. During the dismantling process, the rectifier cone steel lining is used as a hanging point.

7. The method for installing and constructing a rectifier cone for a vertical inlet and outlet of a pumped storage power station according to claim 6, characterized in that: Use cantilevered rotatable convenient disassembly and assembly lifting equipment to assist in the dismantling of the steel pipe formwork and the suspended steel truss steel platform; The cantilever rotatable convenient disassembly and assembly lifting device comprises: Electric hoist track; A first gantry is arranged at the first end of the electric hoist track, and a counterweight is arranged on the first gantry; A second gantry is arranged in the middle of the electric hoist track; A rotating mechanism is arranged between the electric hoist track and the first gantry, so that the electric hoist track can realize horizontal rotation around the rotating mechanism; An electric hoist is installed on the electric hoist track; The lifting carriage is installed on the electric hoist track.

8. The method for installing and constructing the rectifier cone of the vertical inlet and outlet of a pumped storage power station according to claim 7, characterized in that: The electric hoist and the lifting carriage are connected by a connecting rod.

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