Construction method of installing steel structure elevator shaft outside of a hydropower station dam

Abstract

The application discloses a construction method of installing a steel structure elevator shaft outside a dam of a hydropower station, comprising the following steps: 1, assembling a foundation section H-shaped assembling part and a standard section H-shaped assembling part; 2, installing a foundation section shaft on a concrete foundation; 3, sequentially installing at least two standard section shafts from bottom to top at the top end of the foundation section shaft; and 4, sequentially constructing a connecting truss on the auxiliary frame layer at the bottom of each standard section shaft from bottom to top. The application sets the connecting truss on each standard section shaft, which helps to improve the stability of the whole steel structure elevator shaft. The construction method combines a hoisting device, a self-locking working platform and a construction basket, and alternately uses the hoisting device to hoist the self-locking working platform and the steel member required for assembling the steel structure elevator shaft. With the lifting of the self-locking working platform, the purpose of sequentially installing at least two standard section shafts from bottom to top at the top end of the foundation section shaft is achieved.

Description

Technical Field

[0001] This invention belongs to the field of steel structure elevator shaft construction technology, specifically relating to a construction method for installing a steel structure elevator shaft on the outside of a hydropower station dam. Background Technology

[0002] Currently, there are two main methods for installing newly constructed steel structure elevator shafts on the exterior of buildings. The first method involves assembling and raising the various components of the steel structure elevator shaft point by point and layer by layer from bottom to top, such as columns, beams, connecting steel plates, and high-strength bolts. However, this method requires erecting scaffolding around the steel structure elevator shaft, and the scaffolding needs to be raised synchronously with the assembly of the steel structure elevator shaft. After the steel structure elevator shaft is installed, the scaffolding needs to be dismantled from top to bottom, making the construction process cumbersome and labor-intensive. The second method involves assembling the various components of the steel structure elevator shaft first. The method involves segmenting the elevator shaft into modules and then using large lifting equipment to hoist and assemble each module piece by piece. However, this method requires an unrestricted surrounding environment, that the large lifting equipment can be positioned and operate normally, and that scaffolding needs to be erected around the steel structure elevator shaft. When constructing a new steel structure elevator shaft on the outside of existing structures such as hydropower dams, the dams are high, the width is limited, and the surrounding environment at the bottom of the dam is complex, making it inconvenient to erect scaffolding. Therefore, a construction method for installing steel structure elevator shafts on the outside of hydropower dams that is easy to construct should be provided. Summary of the Invention

[0003] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a construction method for installing a steel structure elevator shaft on the outside of a hydropower station dam. This method features a simple structure and reasonable design. By setting connecting trusses on each standard shaft section, the connection between the standard shaft section and the concrete arch dam is achieved, which helps improve the stability of the entire steel structure elevator shaft. The construction method combines lifting equipment, a self-locking work platform, and a construction basket. The lifting equipment is used alternately to lift the self-locking work platform and assemble the steel components required for the steel structure elevator shaft. As the self-locking work platform is raised, at least two standard shaft sections are installed sequentially from bottom to top at the top of the foundation shaft section.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a construction method for installing a steel structure elevator shaft on the outside of a hydropower station dam, characterized in that: the steel structure elevator shaft is located on a concrete foundation on the outside of a concrete arch dam; the steel structure elevator shaft includes a base section shaft located at the bottom and fixedly connected to the concrete foundation, and at least two standard section shafts arranged sequentially from bottom to top on the base section shaft; the base section shaft includes a base embedded plate pre-embedded in the concrete foundation and at least four base columns vertically installed on the base embedded plate, with a base ring beam arranged between two adjacent base columns; the standard section shaft includes a standard column set at the top of the base column and at least two standard ring beam layers arranged at intervals along the height direction of the standard column, with a base ring beam arranged between two adjacent standard columns. Auxiliary frame layers are arranged between the ring beam layers. The standard ring beam layer includes at least four standard ring beams located in the same horizontal plane. The auxiliary frame layer includes at least four auxiliary ring beams located in the same horizontal plane. A connecting truss for connecting with the concrete arch dam is provided on the bottom auxiliary frame layer. The connecting truss includes at least two parallel transverse connecting rods and at least two longitudinal connecting rods connected to the transverse connecting rods. A diagonal connecting rod is provided between the outermost transverse connecting rod and the outer wall of the concrete arch dam. One end of the transverse connecting rod is fixedly connected to the transversely arranged auxiliary ring beam, and the other end of the transverse connecting rod is connected to the outer wall of the concrete arch dam. Truss embedded parts for connecting with the transverse connecting rods or diagonal connecting rods are pre-embedded on the outer wall of the concrete arch dam.

[0005] The construction method includes the following steps:

[0006] Step 1: Assemble the basic H-shaped assembly and the standard H-shaped assembly:

[0007] Two foundation columns and one foundation ring beam are assembled to form a foundation section H-shaped assembly, and two standard columns and one standard ring beam are assembled to form a standard section H-shaped assembly.

[0008] Step 2: Install the foundation section shaft on the concrete foundation. The specific process includes:

[0009] Step 201: Embed a foundation plate in the concrete foundation;

[0010] Step 202: Using the lifting equipment located at the top of the concrete arch dam, at least two of the foundation section H-shaped assembly pieces are hoisted and vertically fixed on the foundation embedded plate in sequence;

[0011] Step 203: Erect a scaffolding operating platform between at least two of the aforementioned foundation H-shaped assembly components to install the remaining foundation ring beams;

[0012] Step 3: Install at least two standard shaft sections sequentially from bottom to top at the top of the basic shaft section. The specific process includes:

[0013] Step 301: Use the lifting equipment to set up a self-locking working platform at the top of the foundation section shaft, so that the self-locking working platform is erected on the foundation ring beams of the two oppositely arranged H-shaped assembly components of the foundation section;

[0014] The self-locking work platform includes a rectangular work platform that matches the inner cavity of the steel structure elevator shaft and self-locking components set at the four corners of the rectangular work platform.

[0015] Step 302: Using the lifting equipment, two standard H-shaped assembly sections, at least two standard ring beams, and at least two auxiliary ring beams are hoisted in sequence. The operator assembles the first standard shaft section on the self-locking work platform.

[0016] Step 303: Use lifting equipment to lift the self-locking work platform upwards, so that the self-locking work platform is erected on the two standard ring beams arranged opposite to each other in the first standard section of the shaft.

[0017] Step 304: Using the lifting equipment, two standard H-shaped assembly sections, at least two standard ring beams, and at least two auxiliary ring beams are lifted in sequence. The operator assembles the second standard shaft section on the self-locking work platform.

[0018] Step 305: Repeat steps 303 and 304 until all the standard shaft sections are assembled.

[0019] Step 4: Construct connecting trusses sequentially from bottom to top on the bottom auxiliary frame layer of each standard shaft section. The construction method for each connecting truss is the same. The construction process for any one connecting truss is as follows:

[0020] Step 401: From the suspended construction basket at the top of the concrete arch dam to the bottom of any of the standard section shafts, the construction personnel use the construction basket to drill holes and install reinforcement bars on the outer wall of the concrete arch dam to install the truss embedded parts.

[0021] Step 402: Use the lifting equipment to set up a self-locking working platform in any of the standard shaft sections;

[0022] Step 403: Use the lifting equipment to hoist any one of the transverse connecting rods of the connecting truss. Construction workers use a self-locking work platform and a construction basket to install and fix both ends of the transverse connecting rod.

[0023] Step 404: Use the lifting equipment to hoist any one of the longitudinal connecting rods of the connecting truss. Construction workers use a self-locking work platform to lay flat plates one by one above the transverse connecting rod along the direction from the standard section shaft toward the concrete arch dam to form a temporary work platform. Use the temporary work platform to install at least two of the longitudinal connecting rods.

[0024] Step 405: Use the lifting equipment to hoist any one of the diagonal tie rods of the connecting truss. Construction workers use a temporary work platform and a construction basket to install the diagonal tie rod.

[0025] Step 406: Remove the flat plates one by one along the direction from the concrete arch dam toward the standard section shaft until the temporary working platform is completely removed.

[0026] The above-mentioned construction method for installing a steel structure elevator shaft on the outside of a hydropower station dam is characterized in that: the rectangular working platform includes a rectangular frame, a U-shaped cover plate fixedly laid in the rectangular frame, and a central cover plate hinged to the U-shaped cover plate; the rectangular frame is provided with a plurality of reinforcing rods arranged in a horizontal and vertical crisscross pattern to support the U-shaped cover plate; and a square manhole is formed between the four horizontal and vertical reinforcing rods.

[0027] The above-mentioned construction method for installing a steel structure elevator shaft on the outside of a hydropower station dam is characterized in that: the self-locking component includes limiting plates that are rotatably installed at the four corners of the rectangular frame via pins, and a limiting pad is provided below the end of the limiting plate away from the rectangular frame.

[0028] The above-mentioned construction method for installing a steel structure elevator shaft on the outside of a hydropower station dam is characterized in that: a manned basket is provided directly below the self-locking work platform, and a ladder is provided inside the manned basket. Construction personnel inside the manned basket can enter the self-locking work platform through the ladder and the square manhole.

[0029] The above-mentioned construction method for installing a steel structure elevator shaft on the outside of a hydropower station dam is characterized in that: two symmetrically arranged lifting lugs are provided on the top surface of the U-shaped cover plate.

[0030] The above-mentioned construction method for installing a steel structure elevator shaft on the outside of a hydropower station dam is characterized in that: the temporary working platform is covered with patterned steel plates.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. This invention combines a construction method using lifting equipment, a self-locking work platform, and a construction basket. It not only utilizes the lifting equipment for on-site hoisting of steel components such as the foundation section H-shaped assembly, standard section H-shaped assembly, foundation ring beam, standard ring beam, and auxiliary ring beam, but also utilizes the lifting equipment to lift the self-locking work platform. By alternating and cyclically using the lifting equipment, and with the lifting of the self-locking work platform, at least two standard section shafts are sequentially installed from bottom to top at the top of the foundation section shaft.

[0033] 2. In step one of this invention, multiple basic H-shaped assembly components and multiple standard H-shaped assembly components are first assembled. Each basic H-shaped assembly component and standard H-shaped assembly component is treated as an assembly module. The basic H-shaped assembly component or standard H-shaped assembly component is lifted in one go using a lifting device. The basic H-shaped assembly component and standard H-shaped assembly component provide stable support for the erection of the self-locking work platform. Only when the self-locking work platform is erected on two relatively arranged basic H-shaped assembly components can the construction personnel assemble the first standard section of the shaft on the self-locking work platform. Only when the self-locking work platform is erected on two relatively arranged standard H-shaped assembly components on the next layer can the construction personnel assemble the next layer of standard section shaft on the self-locking work platform.

[0034] 3. In step two of this invention, since the structure of the foundation section shaft is not exactly the same as that of the standard section shaft, the bottom end of the foundation section shaft needs to be fixedly installed in the concrete foundation. The foundation section shaft needs to provide stable support for the standard section shaft above. The foundation section shaft is located at the lowest end. A scaffolding operating platform can be erected between at least two foundation section H-shaped assemblies. The remaining foundation ring beams can be installed using the scaffolding operating platform. Since the height of the scaffolding operating platform does not exceed the height of the foundation ring beam of the foundation section shaft and is located between at least two foundation section H-shaped assemblies, it is small in size, easy to erect and dismantle, and helps to improve the construction efficiency of the foundation section shaft installation.

[0035] 4. This invention improves the stability of the entire steel structure elevator shaft by setting a connecting truss on the lowest auxiliary frame layer of each standard shaft section. The connecting truss connects the standard shaft section to the concrete arch dam, which helps to improve the stability of the entire steel structure elevator shaft. When constructing the connecting truss, construction baskets, lifting equipment, self-locking work platforms and temporary work platforms are used to complete the connection between the connecting truss and the standard shaft section on the outer wall of the concrete arch dam. The construction process is reasonably designed, highly safe, and easy to promote and apply.

[0036] In summary, this invention has a simple structure and reasonable design. By setting connecting trusses on each standard section of the elevator shaft, the connection between the standard section and the concrete arch dam is achieved, which helps to improve the stability of the entire steel structure elevator shaft. By combining the construction method of lifting equipment, self-locking work platform and construction basket, the lifting equipment is used alternately to lift the self-locking work platform and the steel components required for assembling the steel structure elevator shaft. As the self-locking work platform is raised, the purpose of installing at least two standard sections of the elevator shaft from bottom to top at the top of the foundation section is achieved.

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0038] Figure 1 This is a flowchart of the present invention.

[0039] Figure 2 This is a schematic diagram of the construction state of the present invention.

[0040] Figure 3 for Figure 2 Top view.

[0041] Figure 4 This is a schematic diagram showing the connection between the self-locking working platform and the standard section well passage of the present invention.

[0042] Figure 5 for Figure 4 Top view.

[0043] Figure 6 This is a schematic diagram showing the connection relationship between the rectangular frame, reinforcing rod, and self-locking assembly of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045]

[0046] Detailed Implementation

[0047] like Figure 1 , Figure 2 and Figure 3The diagram illustrates a construction method for installing a steel structure elevator shaft on the outer side of a hydropower station dam. The steel structure elevator shaft is located on a concrete foundation 2 on the outer side of a concrete arch dam 1. The elevator shaft includes a base section shaft fixedly connected to the concrete foundation 2 at its bottom and at least two standard section shafts arranged sequentially from bottom to top of the base section shafts. Each base section shaft includes a base plate 3-1 embedded in the concrete foundation 2 and at least four base columns 3-2 vertically installed on the base plate 3-1. A base ring beam 3-3 is provided between adjacent base columns 3-2. Each standard section shaft includes a standard column 4-1 located at the top of the base column 3-1 and at least two standard ring beam layers spaced apart along the height of the standard column 4-1. An auxiliary frame layer is provided between adjacent standard ring beam layers. The layer includes at least four standard ring beams 4-2 located in the same horizontal plane. The auxiliary frame layer includes at least four auxiliary ring beams 4-3 located in the same horizontal plane. A connecting truss for connecting with the concrete arch dam 1 is provided on the bottom auxiliary frame layer. The connecting truss includes at least two parallel transverse connecting rods 5-1 and at least two longitudinal connecting rods 5-2 connected to the transverse connecting rods 5-1. A diagonal connecting rod 5-3 is provided between the outermost transverse connecting rod 5-1 and the outer wall of the concrete arch dam 1. One end of the transverse connecting rod 5-1 is fixedly connected to the transversely arranged auxiliary ring beams 4-3, and the other end of the transverse connecting rod 5-1 is connected to the outer wall of the concrete arch dam 1. A truss embedded part 5-4 for connecting with the transverse connecting rod 5-1 or the diagonal connecting rod 5-3 is pre-embedded on the outer wall of the concrete arch dam 1.

[0048] The construction method includes the following steps:

[0049] Step 1: Assemble the basic H-shaped assembly and the standard H-shaped assembly:

[0050] Two foundation columns 3-2 and one foundation ring beam 3-3 are assembled to form a foundation section H-shaped assembly, and two standard columns 4-1 and one standard ring beam 4-2 are assembled to form a standard section H-shaped assembly.

[0051] Step 2: Install the foundation section shaft on the concrete foundation 2. The specific process includes:

[0052] Step 201: Embed the foundation plate 3-1 in the concrete foundation 2;

[0053] Step 202: Using the lifting equipment 6 located at the top of the concrete arch dam 1, at least two of the foundation section H-shaped assembly pieces are hoisted and vertically fixed on the foundation embedded plate 3-1 in sequence;

[0054] Step 203: Erect a scaffolding operating platform between at least two of the aforementioned foundation H-shaped assembly components to install the remaining foundation ring beams 3-3;

[0055] Step 3: Install at least two standard shaft sections sequentially from bottom to top at the top of the basic shaft section. The specific process includes:

[0056] Step 301: Use the lifting equipment 6 to set up a self-locking working platform at the top of the foundation section shaft, so that the self-locking working platform is erected on the foundation ring beams 3-3 of the two foundation section H-shaped assembly components arranged opposite to each other;

[0057] The self-locking work platform includes a rectangular work platform 8 that matches the inner cavity of the steel structure elevator shaft and self-locking components set at the four corners of the rectangular work platform 8.

[0058] Step 302: Using the lifting equipment 6, lift two standard H-shaped assembly parts, at least two standard ring beams 4-2 and at least two auxiliary ring beams 4-3 in sequence. The operator assembles the first standard shaft section on the self-locking work platform.

[0059] Step 303: Use the lifting equipment 6 to lift the self-locking working platform upwards, so that the self-locking working platform is erected on the two standard ring beams 4-2 arranged opposite to each other in the first standard section of the shaft.

[0060] Step 304: Using the lifting equipment 6, lift two standard H-shaped assembly parts, at least two standard ring beams 4-2 and at least two auxiliary ring beams 4-3 in sequence. The operator assembles the second standard shaft section on the self-locking work platform.

[0061] Step 305: Repeat steps 303 and 304 until all the standard shaft sections are assembled.

[0062] Step 4: Construct connecting trusses sequentially from bottom to top on the bottom auxiliary frame layer of each standard shaft section. The construction method for each connecting truss is the same. The construction process for any one connecting truss is as follows:

[0063] Step 401: From the top of the concrete arch dam 1, the construction team uses the suspended construction basket to drill holes and install reinforcement bars on the outer wall of the concrete arch dam 1 to install the truss embedded parts 5-4.

[0064] Step 402: Use the lifting equipment 6 to set up a self-locking working platform in any of the standard shaft sections;

[0065] Step 403: Use the lifting equipment 6 to lift any one of the transverse connecting rods 5-1 of the connecting truss. Construction workers use a self-locking work platform and a construction basket to install and fix both ends of the transverse connecting rod 5-1 respectively.

[0066] Step 404: Use the lifting equipment 6 to lift any one of the longitudinal connecting rods 5-2 of the connecting truss. The construction workers use a self-locking work platform to lay flat plates one by one above the transverse connecting rod 5-1 along the direction from the standard section shaft toward the concrete arch dam 1 to form a temporary work platform. Use the temporary work platform to install at least two of the longitudinal connecting rods 5-2.

[0067] Step 405: Use the lifting equipment 6 to hoist any one of the diagonal connecting rods 5-3 of the connecting truss. Construction workers use a temporary work platform and a construction basket to install the diagonal connecting rod 5-3.

[0068] Step 406: Remove the flat plates one by one along the direction from the concrete arch dam 1 toward the standard section shaft until the temporary working platform is completely removed.

[0069] In this embodiment, during the construction of the steel structure elevator shaft on the outside of the hydropower station dam, due to the proximity of the outside of the dam to the existing mountain 7 and the narrow space where the concrete foundation 2 is located, and the fact that there are two sets of steel structure elevator shafts to be built, with a net depth of 2410mm and a net width of 2850mm for each shaft, under these limited conditions, it is neither feasible to erect scaffolding around the steel structure elevator shaft nor to assemble and hoist the steel structure elevator shaft in sections. Therefore, considering the operable top of the concrete arch dam 1... The specifications and models of the lifting equipment 6 are described, and a construction method combining the lifting equipment 6, the self-locking work platform, and the construction basket is proposed. This method not only utilizes the lifting equipment 6 for on-site hoisting of steel components such as the foundation section H-shaped assembly, the standard section H-shaped assembly, the foundation ring beam 3-3, the standard ring beam 4-2, and the auxiliary ring beam 4-3, but also utilizes the lifting equipment 6 for lifting the self-locking work platform. By alternating and cyclically using the lifting equipment 6, and with the lifting of the self-locking work platform, the purpose of installing at least two of the standard section shafts sequentially from bottom to top at the top of the foundation section shaft is achieved.

[0070] In this embodiment, in step one, multiple basic H-shaped assembly components and multiple standard H-shaped assembly components are first assembled. The advantages are: First, although the conditions for assembling and hoisting the steel structure elevator shaft section by section are not available, assembling the two foundation columns 3-2 and one foundation ring beam 3-3 required for the basic shaft section to form a basic H-shaped assembly component, and assembling the two standard columns 4-1 and one standard ring beam 4-2 required for the standard shaft section to form a standard H-shaped assembly component, means that the basic H-shaped assembly component and the standard H-shaped assembly component are each used as an assembly module, utilizing lifting... The conditions for equipment 6 to hoist the foundation section H-shaped assembly or the standard section H-shaped assembly in a single operation are met; secondly, the foundation section H-shaped assembly and the standard section H-shaped assembly provide stable support for the erection of the self-locking work platform. Only by first erecting the self-locking work platform on the two relatively arranged foundation section H-shaped assemblies can the construction personnel assemble the first standard section shaft on the self-locking work platform. Only by erecting the self-locking work platform on the next layer of two relatively arranged standard section H-shaped assemblies can the construction personnel assemble the next layer of standard section shaft on the self-locking work platform.

[0071] In this embodiment, in step two, since the structure of the foundation section shaft is not exactly the same as that of the standard section shaft, the bottom end of the foundation section shaft needs to be fixedly installed in the concrete foundation 2. The foundation section shaft needs to provide stable support for the standard section shaft above. The foundation section shaft is located at the lowest end, and a scaffolding operating platform can be erected between at least two of the foundation section H-shaped assembly pieces. The remaining foundation ring beams 3-3 can be installed using the scaffolding operating platform. Since the height of the scaffolding operating platform does not exceed the height of the foundation ring beams 3-3 of the foundation section shaft and is located between at least two of the foundation section H-shaped assembly pieces, it is small in size, easy to erect and dismantle, and helps to improve the construction efficiency of the foundation section shaft installation.

[0072] In this embodiment, by setting a connecting truss on the lowest auxiliary frame layer of each standard section of the elevator shaft, the connection between the standard section of the elevator shaft and the concrete arch dam 1 is realized by using the connecting truss, which helps to improve the stability of the entire steel structure elevator shaft.

[0073] In this embodiment, the connecting truss includes a transverse connecting rod 5-1, a longitudinal connecting rod 5-2, and a diagonal connecting rod 5-3. One end of the transverse connecting rod 5-1 is fixedly connected to the auxiliary ring beam 4-3 arranged transversely, and the other end of the transverse connecting rod 5-1 is connected to the outer wall of the concrete arch dam 1. One end of the diagonal connecting rod 5-3 is connected to the transverse connecting rod 5-1, and the other end of the diagonal connecting rod 5-3 is connected to the outer wall of the concrete arch dam 1. In actual use, multiple connecting trusses can share the load borne by the foundation section shaft, and the two diagonal connecting rods 5-3 can widen the connection range between the standard section shaft and the concrete arch dam 1, ensuring reliable connection and structural stability.

[0074] In this embodiment, in step four, during the construction of the connecting truss, the construction basket, lifting equipment 6, and self-locking work platform are used simultaneously to complete the connection between the connecting truss on the outer wall of the concrete arch dam 1 and the standard section shaft. By pre-embedding multiple truss embedded parts 5-4 on the outer wall of the concrete arch dam 1, the other end of the transverse connecting rod 5-1 or the other end of the diagonal connecting rod 5-3 is connected to the truss embedded part 5-4. Therefore, the construction personnel use the construction basket to drill holes and install reinforcement bars to install the truss embedded part 5-4.

[0075] After the installation of the transverse connecting rod 5-1 is completed, the construction personnel need to use a self-locking working platform to lay flat plates one by one above the transverse connecting rod 5-1 along the direction from the standard section shaft toward the concrete arch dam 1 to form a temporary working platform. The temporary working platform is used to install at least two of the longitudinal connecting rods 5-2. Then, the temporary working platform and the construction basket are used simultaneously to install the inclined connecting rod 5-3. The construction process is reasonably designed, highly safe, and easy to promote and apply.

[0076] like Figure 4 , Figure 5 and Figure 6 As shown, in this embodiment, the rectangular work platform 8 includes a rectangular frame 8-1, a U-shaped cover plate 8-4 fixedly laid inside the rectangular frame 8-1, and a central cover plate 8-5 hinged to the U-shaped cover plate 8-4 by a hinge 8-6. The rectangular frame 8-1 is provided with a plurality of horizontally and vertically intersecting reinforcing rods 8-2 for supporting the U-shaped cover plate 8-4. A square manhole 8-3 is formed between the four horizontally and vertically intersecting reinforcing rods 8-2.

[0077] In actual use, the central cover plate 8-5 can be opened upward around the hinge 8-6. The square manhole 8-3 is located directly below the central cover plate 8-5. When the central cover plate 8-5 is opened, construction personnel can enter the rectangular work platform 8 through the square manhole 8-3. When the central cover plate 8-5 is closed, construction personnel can walk and carry out construction on the rectangular work platform 8.

[0078] In this embodiment, the self-locking component includes limiting plates 9-1 that are rotatably mounted at the four corners of the rectangular frame 8-1 via pins 9-2, and a limiting pad 9-3 is provided below the end of the limiting plate 9-1 that is away from the rectangular frame 8-1.

[0079] In actual use, when the lifting equipment 6 lifts the rectangular working platform 8, when the end of the limiting plate 9-1 away from the limiting pad 9-3 touches the standard ring beam 4-2 or the auxiliary ring beam 4-3, the end of the limiting plate 9-1 away from the limiting pad 9-3 will rotate downward around the pin 9-2, thus allowing the rectangular working platform 8 to move upward within the standard section of the shaft. When the lifting equipment 6 lowers the rectangular working platform 8, when the end of the limiting plate 9-1 away from the limiting pad 9-3 touches the standard ring beam 4-2 or the auxiliary ring beam 4-3, the limiting pad 9-3 will prevent the end of the limiting plate 9-1 away from the limiting pad 9-3 from rotating upward around the pin 9-2. Therefore, the end of the limiting plate 9-1 away from the limiting pad 9-3 will be locked onto the standard ring beam 4-2 or the auxiliary ring beam 4-3, thus enabling the rectangular working platform 8 to be erected on the standard ring beam 4-2 or the auxiliary ring beam 4-3.

[0080] In this embodiment, two symmetrically arranged lifting lugs 8-4-1 are provided on the top surface of the U-shaped cover plate 8-4.

[0081] During actual installation, the wire rope 6-1 of the lifting equipment 6 is connected to the two lifting lugs 8-4-1, which enables the rectangular work platform 8 to maintain balance during the lifting process.

[0082] In this embodiment, the temporary work platform is covered with patterned steel plates. In actual use, laying patterned steel plates on the temporary work platform helps to improve the safety of the temporary work platform. After the installation of the longitudinal connecting rod 5-2 and the inclined connecting rod 5-3 is completed, the patterned steel plates can be removed first, and then the flat plates can be removed piece by piece along the direction from the concrete arch dam 1 toward the standard section shaft until the temporary work platform is completely removed.

[0083] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A construction method of installing a steel structure elevator shaft outside a dam of a hydroelectric power station, characterized in that: The steel structure elevator shaft is located on the concrete foundation (2) outside the concrete arch dam (1), and comprises a foundation section shaft located at the bottom and fixedly connected with the concrete foundation (2), and at least two standard section shafts arranged in sequence from bottom to top on the top of the foundation section shaft; the foundation section shaft comprises a foundation embedded plate (3-1) embedded in the concrete foundation (2) and at least four foundation columns (3-2) vertically installed on the foundation embedded plate (3-1), and a foundation ring beam (3-3) is arranged between adjacent two foundation columns (3-2); the standard section shaft comprises a standard column (4-1) arranged at the top of the foundation column (3-1) and at least two standard ring beam layers arranged at intervals along the height direction of the standard column (4-1), an auxiliary frame layer is arranged between adjacent two standard ring beam layers, the standard ring beam layer comprises at least four standard ring beams (4-2) located in the same horizontal plane, the auxiliary frame layer comprises at least four auxiliary ring beams (4-3) located in the same horizontal plane, a connecting truss for connecting with the concrete arch dam (1) is arranged on the auxiliary frame layer at the bottom, the connecting truss comprises at least two transverse connecting rods (5-1) arranged in parallel and at least two longitudinal connecting rods (5-2) connected with the transverse connecting rods (5-1), an inclined connecting rod (5-3) is arranged between the outer side wall of the concrete arch dam (1) and the outermost transverse connecting rod (5-1), one end of the transverse connecting rod (5-1) is fixedly connected with the auxiliary ring beam (4-3) arranged in the transverse direction, and the other end of the transverse connecting rod (5-1) is connected with the outer side wall of the concrete arch dam (1), and a truss embedded part (5-4) for connecting with the transverse connecting rod (5-1) or the inclined connecting rod (5-3) is embedded in the outer side wall of the concrete arch dam (1); The construction method comprises the following steps: Step one, assembling the foundation section H-shaped assembly and the standard section H-shaped assembly: Two foundation columns (3-2) and one foundation ring beam (3-3) are assembled to form a foundation section H-shaped assembly, and two standard columns (4-1) and one standard ring beam (4-2) are assembled to form a standard section H-shaped assembly; Step two, installing the foundation section shaft on the concrete foundation (2), and the specific process comprises: Step 201, embedding the foundation embedded plate (3-1) in the concrete foundation (2); Step 202, using the hoisting equipment (6) located at the top of the concrete arch dam (1) to hoist and vertically fix and install at least two foundation section H-shaped assemblies on the foundation embedded plate (3-1) in sequence; Step 203, erecting a scaffold operation platform between at least two foundation section H-shaped assemblies to install the remaining foundation ring beams (3-3); Step three, sequentially installing at least two standard section shafts from bottom to top on the top of the foundation section shaft, and the specific process comprises: Step 301, using the hoisting device (6) to arrange a self-locking working platform at the top end of the foundation section shaft, so that the self-locking working platform is arranged on the foundation ring beam (3-3) of the two foundation section H-shaped assemblies arranged oppositely; The self-locking working platform comprises a rectangular working platform (8) matched with the inner cavity of the steel structure elevator shaft and a self-locking assembly arranged at each corner of the rectangular working platform (8); Step 302, using the hoisting device (6) to successively hoist two standard section H-shaped assemblies, at least two standard ring beams (4-2) and at least two auxiliary ring beams (4-3), and an operator assembles the first standard section shaft on the self-locking working platform; Step 303, using the hoisting device (6) to lift the self-locking working platform upward, so that the self-locking working platform is arranged on the two standard ring beams (4-2) of the first standard section shaft arranged oppositely; Step 304, using the hoisting device (6) to successively hoist two standard section H-shaped assemblies, at least two standard ring beams (4-2) and at least two auxiliary ring beams (4-3), and an operator assembles the second standard section shaft on the self-locking working platform; Step 305, repeating steps 303 and 304 until the assembly of all the standard section shafts is completed; Step four, from bottom to top, successively constructing a connecting truss on the auxiliary frame layer at the bottom of each standard section shaft, and the construction method of each connecting truss is the same, wherein the construction process of any connecting truss is as follows: Step 401, from the suspended construction basket at the top end of the concrete arch dam (1) to the bottom of any standard section shaft, a construction worker uses the construction basket to drill holes in the outer side wall of the concrete arch dam (1), implant reinforcing bars, and install truss embedded parts (5-4); Step 402, using the hoisting device (6) to arrange a self-locking working platform in any standard section shaft; Step 403, using the hoisting device (6) to hoist the transverse connecting rod (5-1) of any connecting truss, and a construction worker uses the self-locking working platform and the construction basket to respectively install and fix the two ends of the transverse connecting rod (5-1); Step 404, using the hoisting device (6) to hoist the longitudinal connecting rod (5-2) of any connecting truss, and a construction worker uses the self-locking working platform to successively lay flat plates above the transverse connecting rod (5-1) in a direction close to the concrete arch dam (1) from the standard section shaft, forms a temporary working platform, and installs at least two longitudinal connecting rods (5-2) using the temporary working platform; Step 405, using the hoisting device (6) to hoist the inclined connecting rod (5-3) of any connecting truss, and a construction worker uses the temporary working platform and the construction basket to install the inclined connecting rod (5-3); Step 406, successively removing the flat plates in a direction close to the standard section shaft from the concrete arch dam (1) until the temporary working platform is completely removed.

2. A construction method of installing a steel structure elevator shaft outside a dam of a hydroelectric power station according to claim 1, characterized in that: The rectangular operation platform (8) comprises a rectangular frame (8-1), a H-shaped cover plate (8-4) fixedly laid in the rectangular frame (8-1), and a center cover plate (8-5) hingedly installed on the H-shaped cover plate (8-4) through a hinge (8-6), and a plurality of reinforcing rods (8-2) for supporting the H-shaped cover plate (8-4) are arranged in the rectangular frame (8-1) in a horizontal and vertical cross manner, and a square manhole (8-3) is formed between four of the reinforcing rods (8-2) in a horizontal and vertical cross manner.

3. A construction method of a steel structure elevator shaft installed outside a dam of a hydroelectric power plant according to claim 2, characterized in that: The self-locking assembly comprises a limiting plate (9-1) rotatably installed at four corners of the rectangular frame (8-1) through a pin shaft (9-2), and a limiting pad (9-3) is arranged below the end of the limiting plate (9-1) away from the rectangular frame (8-1).

4. A construction method of a steel structure elevator shaft installed outside a dam of a hydroelectric power plant according to claim 2, characterized in that: A manned basket (10) is arranged directly below the self-locking operation platform, a crawling ladder is arranged in the manned basket (10), and a construction worker in the manned basket (10) can enter the self-locking operation platform through the crawling ladder and the square manhole (8-3).

5. A construction method of a steel structure elevator shaft installed outside a dam of a hydroelectric power plant according to claim 2, characterized in that: Two symmetrical lifting lugs (8-4-1) are arranged on the top surface of the H-shaped cover plate (8-4).

6. A construction method of a steel structure elevator shaft installed outside a dam of a hydroelectric power plant according to claim 1, characterized in that: A patterned steel plate is laid on the temporary operation platform.

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