Installation bearing platform and method for units in underground powerhouse of large hydropower station

Abstract

A load-bearing platform and method for unit installation in the underground powerhouse of a large hydropower station, which includes a load-bearing platform, a wedge plate, and an expansion passage. By arranging an annular wedge plate on the outer side of the columnar load-bearing platform and an expansion passage inside the load-bearing platform, a storage passage and a manhole passage are connected to the annular cavity. The load-bearing platform is located in the lower frame foundation pit, and the wedge plate is located between the outer wall of the load-bearing platform and the inner wall of the stator foundation pit. Assembly operations are carried out on the load-bearing platform located in the stator foundation pit through the lower frame and the cover plate. After assembly, the lower frame, the cover plate, and the load-bearing platform are hoisted back into the powerhouse in sequence, and then the lower frame and the cover plate are hoisted into the lower frame foundation pit and the stator foundation pit respectively for assembly. The present invention overcomes the problem that the installation of the lower frame and the cover plate cannot be carried out synchronously due to the limited space in the original underground hydropower station powerhouse, which affects the overall installation progress of the unit. It has the characteristics of simple structure, expanding the construction site in the powerhouse, saving the construction period, accelerating the unit installation progress, and being simple and convenient to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of installation of hydroelectric generating units, and relates to a load-bearing platform and method for installing units in an underground powerhouse of a large hydropower station. Background Art

[0002] For the underground powerhouse of a large hydropower station, the earthwork excavation volume is large, the excavation cost is high, the layout of the powerhouse is relatively compact, the space of the installation yard and the unit section is small, and the operation site resources available for unit installation are relatively scarce. During the unit installation process, there is often a shortage of operation sites, resulting in a lag in non-critical construction periods, which in turn leads to a lag in critical construction periods, affecting the overall unit installation progress and causing relatively large economic losses. For example: after the stator foundation construction is completed, there is still a lower frame unit foundation pit in the center of the stator installation base surface, and there is also a top cover assembly installation foundation pit above the stator installation base. Due to the existence of the lower frame unit foundation pit in the center of the stator foundation, the operation space of the stator foundation pit becomes smaller, resulting in the assembly of the lower frame and the top cover not being able to be completed in the stator foundation pit, affecting the overall unit installation progress. Summary of the Invention

[0003] The technical problem to be solved by the invention is to provide a load-bearing platform and method for installing units in an underground powerhouse of a large hydropower station, which has a simple structure. A ring-shaped wedge plate is arranged outside the load-bearing platform of the columnar structure, an expansion channel is arranged inside the load-bearing platform, the storage channel and the manhole channel are communicated with the annular cavity, the load-bearing platform is located in the lower frame foundation pit, the wedge plate is located between the outer wall of the load-bearing platform and the inner wall of the stator foundation pit, the lower frame and the cover plate are assembled on the load-bearing platform in the stator foundation pit, and after assembly, the lower frame, the cover plate and the load-bearing platform are hoisted back into the powerhouse in sequence, and then the lower frame and the cover plate are hoisted into the lower frame foundation pit and the stator foundation pit respectively for assembly. The construction site in the powerhouse is expanded, the construction period is saved, the unit installation progress is accelerated, and the operation is simple and convenient.

[0004] To solve the above technical problems, the technical solution adopted by the invention is: a load-bearing platform for installing units in an underground powerhouse of a large hydropower station, which includes a load-bearing platform, a wedge plate and an expansion channel; the load-bearing platform is a columnar body of a ring structure, a plurality of wedge plates are annularly arranged on the outer wall of the columnar body, the annular cavity of the expansion channel is located inside the columnar body, the storage channel is located on the upper side surface of the columnar body and is communicated with the annular cavity, a channel cover is matched with the storage channel, and a plurality of lifting rings are connected to the upper side surface of the load-bearing platform.

[0005] The load-bearing platform is a reinforced concrete box girder structure, and the annular cavity is on the same axis as the load-bearing platform.

[0006] The wedge plate is an arc-shaped plate, and the lower end extends out of the lower side surface of the load-bearing platform.

[0007] The expansion channel includes a storage channel communicated with the annular cavity, a channel cover matched with the storage channel, and the channel cover is flush with the upper side surface of the load-bearing platform.

[0008] A manhole passage is arranged in the annular cavity. The manhole passage passes through the lower side of the load-bearing platform, and a manhole cover is matched with the manhole passage.

[0009] The unit installation method for the unit installation load-bearing platform of the underground powerhouse of a large hydropower station as described above includes the following steps:

[0010] S1. Connect the lifting equipment with the lifting rings of the load-bearing platform, lift the load-bearing platform into the stator foundation pit, and make the bottom of the load-bearing platform contact with the upper side of the lower frame foundation. At this time, the upper side of the load-bearing platform is flush with the stator installation base surface.

[0011] S2. Wedge multiple wedge plates into the space between the outer wall of the load-bearing platform and the inner wall of the lower frame foundation one by one. The lower end of the wedge plate extends into the limit groove of the lower frame foundation to cooperate with it, and the upper side of the wedge plate is flush with the upper side of the load-bearing platform; disassemble the lifting rings.

[0012] S3. Use the lifting equipment to hoist the components of the lower frame and the top cover onto the load-bearing platform respectively, and then transfer the components of the frame and the top cover to the stator installation base on one side of the load-bearing platform to vacate the space for assembly; the lower frame and the top cover can be assembled on the load-bearing platform.

[0013] S4. During the installation process, for the assembly of smaller components, open the storage passage, use the lifting equipment to hoist the smaller components into the annular cavity; set up a ladder or use the lifting equipment to allow the operators to enter the annular cavity; after assembly, hoist them back onto the load-bearing platform to assemble with the remaining components; during operation, the annular cavity is connected with the stator foundation pit by a ventilation device.

[0014] S5. When an auxiliary mechanism needs to be installed under the lower frame foundation during the assembly process, open the manhole cover to facilitate the operators to enter the space under the lower frame foundation for operation.

[0015] S6. After the assembly of the lower frame and the cover is completed, use the lifting equipment to hoist the lower frame and the cover to the powerhouse above the stator foundation pit respectively, and then hoist the load-bearing platform to the powerhouse above the stator foundation pit.

[0016] S7. Install the unit. First, use the lifting equipment to hoist the lower frame into the lower frame foundation pit, then use the lifting equipment to hoist the stator into the stator foundation pit, then install the lower frame and the stator, and finally assemble the cover with the stator.

[0017] A load-bearing platform for unit installation in the underground powerhouse of a large hydropower station, which includes a load-bearing platform, wedge plates, and an expansion channel; the load-bearing platform is a columnar body with a ring structure, multiple wedge plates are arranged annularly on the outer wall of the columnar body, the annular cavity of the expansion channel is located inside the columnar body, the storage channel is connected to the annular cavity on the upper side of the columnar body, a channel cover is provided in cooperation with the storage channel, and multiple lifting rings are connected to the upper side of the load-bearing platform. The structure is simple. When in use, by arranging annular wedge plates on the outer side of the columnar load-bearing platform, an expansion channel is arranged inside the load-bearing platform, the storage channel and the manhole channel are connected to the annular cavity, the load-bearing platform is located in the lower rack foundation pit, the wedge plates are located between the outer wall of the load-bearing platform and the inner wall of the stator foundation pit, assembly operations are carried out on the load-bearing platform located in the stator foundation pit through the lower rack and the cover plate. After assembly, the lower rack, the cover plate, and the load-bearing platform are hoisted back into the powerhouse in sequence, and then the lower rack and the cover plate are hoisted into the lower rack foundation pit and the stator foundation pit respectively for assembly, expanding the construction site in the powerhouse, saving the construction period, accelerating the unit installation progress, and being simple and convenient to operate.

[0018] In the preferred solution, the load-bearing platform is a reinforced concrete box girder structure, and the annular cavity is on the same axis as the load-bearing platform. The structure is simple. During fabrication, the load-bearing platform adopts a reinforced concrete box girder structure, which has good versatility. When fabricating multiple ones at a time, it is convenient to carry out synchronous operations in multiple stator foundation pits, improving the efficiency of unit installation in the entire powerhouse.

[0019] In the preferred solution, the wedge plate is an arc-shaped plate, and the lower end extends out of the lower side of the load-bearing platform. The structure is simple. When in use, the arc-shaped wedge plate is inserted into the gap between the outer wall of the load-bearing platform and the inner wall of the lower rack foundation pit. The lower side of the wedge plate cooperates with the limit groove of the lower rack foundation pit, and the upper side of the wedge plate is flush with the upper side of the load-bearing platform, making the whole flush with the base surface of the stator foundation pit, improving the stability during the transfer of components during the assembly process.

[0020] In the preferred solution, the expansion channel includes a storage channel connected to the annular cavity, a channel cover provided in cooperation with the storage channel, and the channel cover is flush with the upper side of the load-bearing platform. The structure is simple. When in use, when needed, smaller components or tools used for assembly can be hoisted into the annular cavity in advance, reducing the occupancy of the upper space of the load-bearing platform; when hoisting in, the channel cover is opened, and the operator enters the annular cavity using a ladder to assist in hoisting, or a hoisting device is used to hoist the operator into the annular cavity to assist in hoisting.

[0021] In the preferred solution, a manhole channel is arranged in the annular cavity, the manhole channel passes through the lower side of the load-bearing platform, and a manhole cover is provided in cooperation with the manhole channel. The structure is simple. When in use, the annular cavity not only reduces the overall structural weight, facilitates the storage of tools during storage operations and the assembly operations of smaller components, but also further expands the working space.

[0022] In a preferred embodiment, the unit installation method for the unit installation load-bearing platform of the underground powerhouse of a large hydropower station is as follows:

[0023] S1. Connect the lifting equipment to the lifting ring of the load-bearing platform, lift the load-bearing platform into the stator foundation pit, and make the bottom of the load-bearing platform contact the upper side of the lower frame foundation. At this time, the upper side of the load-bearing platform is flush with the stator installation base surface.

[0024] S2. Wedge multiple wedge plates into the space between the outer wall of the load-bearing platform and the inner wall of the lower frame foundation one by one. The lower end of the wedge plate extends into the limit groove of the lower frame foundation and fits with it, and the upper side of the wedge plate is flush with the upper side of the load-bearing platform. Then remove the lifting ring.

[0025] S3. Use the lifting equipment to hoist the components of the lower frame and the top cover onto the load-bearing platform respectively, and then transfer the components of the frame and the top cover to the stator installation base on one side of the load-bearing platform to vacate the space for assembly. The lower frame and the top cover can be assembled on the load-bearing platform.

[0026] S4. During the installation process, for the assembly of smaller components, open the storage passage, use the lifting equipment to lift the smaller components into the annular cavity; set up a ladder or use the lifting equipment to allow the operators to enter the annular cavity; after the assembly is completed, lift them back to the load-bearing platform to assemble with the remaining components. During operation, the annular cavity is connected to the stator foundation pit by a ventilation device.

[0027] S5. When an auxiliary mechanism needs to be installed under the lower frame foundation during the assembly process, open the manhole cover to facilitate the operators to enter the space under the lower frame foundation for operation.

[0028] S6. After the assembly of the lower frame and the cover is completed, use the lifting equipment to lift the lower frame and the cover to the powerhouse above the stator foundation pit respectively, and then lift the load-bearing platform to the powerhouse above the stator foundation pit.

[0029] S7. Install the unit. First, use the lifting equipment to lift the lower frame into the lower frame foundation pit, then use the lifting equipment to lift the stator into the stator foundation pit, and then install the lower frame and the stator. Finally, assemble the cover and the stator. This method is simple and convenient to operate, expands the installation operation space of the lower frame and the cover, and improves the overall installation progress of the unit.

[0030] A load-bearing platform and method for unit installation in the underground powerhouse of a large hydropower station, which includes a load-bearing platform, a wedge plate, and an expansion passage. By arranging an annular wedge plate outside the columnar load-bearing platform and an expansion passage inside the load-bearing platform, the storage passage and the manhole passage are connected to the annular cavity. The load-bearing platform is located in the lower frame foundation pit, and the wedge plate is located between the outer wall of the load-bearing platform and the inner wall of the stator foundation pit. Assembly operations are carried out on the load-bearing platform inside the stator foundation pit through the lower frame and the cover plate. After assembly, the lower frame, the cover plate, and the load-bearing platform are hoisted back into the powerhouse in sequence, and then the lower frame and the cover plate are hoisted into the lower frame foundation pit and the stator foundation pit respectively for assembly. The present invention overcomes the problems of limited space in the original underground hydropower station powerhouse, the inability to synchronize the installation of the lower frame and the cover plate, which affects the overall installation progress of the unit. It has the characteristics of simple structure, expanded construction site in the powerhouse, saved construction period, accelerated unit installation progress, and simple and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below in conjunction with the drawings and embodiments:

[0032] Figure 1 It is a schematic structural diagram of the present invention.

[0033] Figure 2 is Figure 1 front view schematic diagram of

[0034] Figure 3 is Figure 2 top view schematic diagram of

[0035] Figure 4 is Figure 3 A-A cross-sectional schematic diagram of

[0036] Figure 5 It is a usage state diagram of the present invention.

[0037] In the figure: load-bearing platform 1, lifting ring 11, wedge plate 2, expansion passage 3, annular cavity 31, storage passage 32, passage cover 33, manhole passage 34, manhole cover 35. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] As Figures 1 to 5In a large hydropower station's underground powerhouse unit installation load-bearing platform, it includes a load-bearing platform 1, wedge plates 2, and an expansion passage 3; the load-bearing platform 1 is a columnar body with a ring structure, multiple wedge plates 2 are arranged annularly on the outer wall of the columnar body, the annular cavity 31 of the expansion passage 3 is located inside the columnar body, the storage passage 32 is located on the upper side of the columnar body and is connected to the annular cavity 31, a passage cover 33 is provided in cooperation with the storage passage 32, and multiple lifting rings 11 are connected to the upper side of the load-bearing platform 1. The structure is simple. When in use, by arranging annular wedge plates 2 on the outer side of the columnar load-bearing platform 1 and arranging an expansion passage 3 inside the load-bearing platform 1, the storage passage 32 and the manhole passage 34 are connected to the annular cavity 31. The load-bearing platform 1 is located in the lower frame foundation pit, and the wedge plates 2 are located between the outer wall of the load-bearing platform 1 and the inner wall of the stator foundation pit. Assembly operations are carried out on the load-bearing platform 1 in the stator foundation pit through the lower frame and the cover plate. After assembly, the lower frame, the cover plate, and the load-bearing platform 1 are hoisted back into the powerhouse in sequence, and then the lower frame and the cover plate are hoisted to the lower frame foundation pit and the stator foundation pit respectively for assembly. This expands the construction site in the powerhouse, saves the construction period, speeds up the unit installation progress, and is simple and convenient to operate.

[0039] Preferably, the lifting ring 11 is connected to the load-bearing platform 1 by a threaded fit, which is convenient for disassembly after hoisting and avoids interference during assembly operations.

[0040] In a preferred solution, the load-bearing platform 1 is a reinforced concrete box girder structure, and the annular cavity 31 is on the same axis as the load-bearing platform 1. The structure is simple. During production, the load-bearing platform 1 adopts a reinforced concrete box girder structure, which has good versatility. When manufacturing multiple at one time, it is convenient to carry out synchronous operations in multiple stator foundation pits, improving the installation efficiency of the units in the entire powerhouse.

[0041] In a preferred solution, the wedge plate 2 is an arc-shaped plate, and the lower end extends out of the lower side of the load-bearing platform 1. The structure is simple. When in use, the arc-shaped wedge plate 2 is inserted into the gap between the outer wall of the load-bearing platform 1 and the inner wall of the lower frame foundation pit. The lower side of the wedge plate 2 cooperates with the limit groove of the lower frame foundation pit, and the upper side of the wedge plate 2 is flush with the upper side of the load-bearing platform 1, making the whole flush with the base surface of the stator foundation pit, improving the stability during the transfer of components during the assembly process.

[0042] In a preferred solution, the expansion passage 3 includes a storage passage 32 connected to the annular cavity 31, a passage cover 33 provided in cooperation with the storage passage 32, and the passage cover 33 is flush with the upper side of the load-bearing platform 1. The structure is simple. When in use, when needed, smaller components or tools used in assembly can be hoisted into the annular cavity 31 in advance, reducing the occupancy of the upper space of the load-bearing platform 1; when hoisting in, the passage cover 33 is opened, and the operator enters the annular cavity 31 using a ladder to assist in hoisting, or an hoisting device is used to hoist the operator into the annular cavity 31 to assist in hoisting.

[0043] Preferably, when assembling smaller components, the assembly operation can be carried out within the annular cavity 31. During assembly, a ventilation device is connected to the stator foundation pit to ensure sufficient internal oxygen supply.

[0044] In a preferred embodiment, a manhole passage 34 is provided within the annular cavity 31. The manhole passage 34 passes through the lower side of the load-bearing platform 1 and is provided with a manhole cover 35 in cooperation with the manhole passage 34. The structure is simple. During use, the annular cavity 31 not only reduces the overall structural weight, facilitates the storage of tools during storage operations and the assembly of smaller components, but also further expands the working space.

[0045] Preferably, when the foundation pit at the lower part of the lower frame needs to be operated, the manhole passage 34 is opened to facilitate the entry of operators for work, further improving the overall installation progress of the unit.

[0046] In a preferred embodiment, the unit installation method for the load-bearing platform for unit installation in the underground powerhouse of a large hydropower station as described above includes the following steps:

[0047] S1. Connect a lifting device to the lifting ring 11 of the load-bearing platform 1, lift the load-bearing platform 1 and place it in the stator foundation pit. The bottom of the load-bearing platform 1 contacts the upper side of the lower frame foundation. At this time, the upper side of the load-bearing platform 1 is flush with the stator installation base surface.

[0048] S2. Wedge a plurality of wedge plates 2 one by one between the outer wall of the load-bearing platform 1 and the inner wall of the lower frame foundation. The lower end of the wedge plate 2 extends into the limiting groove of the lower frame foundation to cooperate with it, and the upper side of the wedge plate 2 is flush with the upper side of the load-bearing platform 1; disassemble the lifting ring 11.

[0049] S3. Use a lifting device to hoist the components of the lower frame and the top cover onto the load-bearing platform 1 respectively, and then transfer the components of the frame and the top cover to the stator installation base on one side of the load-bearing platform 1 to vacate the space for assembly; the lower frame and the top cover can be assembled on the load-bearing platform 1.

[0050] S4. During the installation process, for the assembly of smaller components, open the storage passage 32, use a lifting device to hoist the smaller components into the annular cavity 31; set up a ladder or use a lifting device to allow operators to enter the annular cavity 31; after assembly, hoist them back onto the load-bearing platform 1 for assembly with the remaining components; during operation, a ventilation device in the annular cavity 31 is connected to the stator foundation pit.

[0051] S5. When an auxiliary mechanism needs to be installed at the lower part of the lower frame foundation during the assembly process, open the manhole cover 35 to facilitate the entry of operators into the space at the lower part of the lower frame foundation for work.

[0052] S6. After the assembly of the lower frame and the cover is completed, use a lifting device to hoist the lower frame and the cover to the powerhouse above the stator foundation pit respectively, and then hoist the load-bearing platform 1 to the powerhouse above the stator foundation pit.

[0053] For S7, the installation unit, first use a hoisting device to lift the lower frame and place it in the lower frame foundation pit, then use a hoisting device to lift the stator and place it in the stator foundation pit. After that, install the lower frame and the stator, and finally assemble the cover plate with the stator. This method is simple and convenient to operate, expands the installation operation space of the lower frame and the cover plate, and improves the overall installation progress of the unit.

[0054] For the load-bearing platform and method for installing units in the underground powerhouse of a large hydropower station as described above, during installation and use, a ring-shaped wedge plate 2 is arranged outside the load-bearing platform 1 of the columnar structure, and an expansion channel 3 is arranged inside the load-bearing platform 1. The storage channel 32 and the manhole channel 34 are connected to the annular cavity 31. The load-bearing platform 1 is located in the lower frame foundation pit, the wedge plate 2 is located between the outer wall of the load-bearing platform 1 and the inner wall of the stator foundation pit, and the lower frame and the cover plate are assembled on the load-bearing platform 1 in the stator foundation pit. After assembly, the lower frame, the cover plate and the load-bearing platform 1 are hoisted back into the powerhouse in sequence, and then the lower frame and the cover plate are hoisted into the lower frame foundation pit and the stator foundation pit respectively for assembly. This expands the construction site in the powerhouse, saves the construction period, speeds up the unit installation progress, and is simple and convenient to operate.

[0055] During manufacturing, the load-bearing platform 1 adopts a reinforced concrete box girder structure, which has good versatility. When multiple are manufactured at one time, it is convenient to carry out synchronous operations in multiple stator foundation pits, improving the installation efficiency of the units in the entire powerhouse.

[0056] During use, insert the arc-shaped wedge plate 2 into the gap between the outer wall of the load-bearing platform 1 and the inner wall of the lower frame foundation pit. The lower side of the wedge plate 2 is matched with the limit groove of the lower frame foundation pit, and the upper side of the wedge plate 2 is flush with the upper side of the load-bearing platform 1, making the whole flush with the base surface of the stator foundation pit, improving the stability during the transfer of components during the assembly process.

[0057] During use, when needed, smaller components or tools used for assembly can be hoisted into the annular cavity 31 in advance, reducing the occupancy of the upper space of the load-bearing platform 1. When hoisting in, open the channel cover 33, and the operator enters the annular cavity 31 using a ladder to assist in hoisting, or use a hoisting device to hoist the operator into the annular cavity 31 to assist in hoisting.

[0058] During use, the annular cavity 31 not only reduces the overall structural weight, facilitates the storage of tools during storage operations and the assembly operations of smaller components, but also further expands the operation space.

[0059] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. In the present application, the embodiments and the features in the embodiments can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A load-bearing platform for unit installation in the underground powerhouse of a large hydropower station, characterized in that: It comprises a load-bearing platform (1), a wedge plate (2) and an expansion channel (3); the load-bearing platform (1) is a columnar body with an annular structure, a plurality of wedge plates (2) are arranged in an annular manner on the outer wall of the columnar body, an annular cavity (31) of the expansion channel (3) is located in the columnar body, a storage channel (32) is located on the upper side of the columnar body and is connected to the annular cavity (31), a channel cover (33) is provided with the storage channel (32), and a plurality of lifting rings (11) are connected to the upper side of the load-bearing platform (1); A manhole channel (34) is provided in the annular cavity (31), the manhole channel (34) passes through the lower side of the load-bearing platform (1), and a manhole cover (35) is provided in cooperation with the manhole channel (34); The unit installation method includes the following steps: S1, using a lifting device to connect to the lifting ring (11) of the load-bearing platform (1), the load-bearing platform (1) is lifted and placed in the stator foundation pit, the bottom of the load-bearing platform (1) is in contact with the side surface of the lower frame foundation, and at this time, the upper side surface of the load-bearing platform (1) is flush with the stator installation foundation surface; S2, wedging a plurality of wedge plates (2) one by one between the outer wall of the load-bearing platform (1) and the inner wall of the lower frame foundation, the lower end of the wedge plate (2) is inserted into the limit groove of the lower frame foundation to cooperate therewith, and the upper side of the wedge plate (2) is flush with the upper side of the load-bearing platform (1); removing the lifting ring (11); S3, using a lifting device to hoist the components of the lower frame and the top cover onto the load-bearing platform (1), and then transferring the components of the frame and the top cover to the stator mounting foundation on one side of the load-bearing platform (1) to free up space for assembly; the lower frame and the top cover can then be assembled on the load-bearing platform (1); S4, during the installation process, for the assembly of smaller parts, the storage passage (32) is opened, and the smaller parts are hoisted into the annular cavity (31) by using a lifting device; a ladder is set up or a lifting device is used for workers to enter the annular cavity (31); after the assembly is completed, the parts are hoisted back onto the load-bearing platform (1) and assembled with the remaining parts; during the operation, the annular cavity (31) is connected to the stator foundation pit by using ventilation equipment; S5, when an auxiliary mechanism needs to be installed at the bottom of the lower frame foundation during the assembly process, the manhole cover (35) is opened to facilitate the operator to enter the space below the lower frame foundation for operation; S6, after the lower frame and the cover plate are assembled, the lower frame and the cover plate are hoisted to the workshop above the stator foundation pit by using a hoisting device, and then the bearing platform (1) is hoisted to the workshop above the stator foundation pit; S7, install the unit, first use the lifting equipment to lift the lower frame into the lower frame foundation pit, then use the lifting equipment to lift the stator into the stator foundation pit, then install the lower frame and stator, and finally assemble the cover plate and the stator.

2. The load-bearing platform for unit installation in the underground powerhouse of a large hydropower station according to claim 1, wherein: The load-bearing platform (1) is a reinforced concrete box beam structure, and the annular cavity (31) and the load-bearing platform (1) are located on the same axis.

3. The load-bearing platform for unit installation in the underground powerhouse of a large hydropower station according to claim 1, characterized in that: The wedge plate (2) is an arc-shaped plate, the lower end of which extends out of the lower side surface of the load-bearing platform (1).

4. The load-bearing platform for unit installation in the underground powerhouse of a large hydropower station according to claim 1, wherein: The expansion channel (3) comprises a storage channel (32) connected to the annular cavity (31), and a channel cover (33) matched with the storage channel (32), wherein the channel cover (33) is flush with the upper side of the load-bearing platform (1).

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