Rapid construction method for steam turbine plant

Abstract

The invention discloses a rapid construction method of a steam turbine plant, which relates to the technical field of industrial plant building, and comprises the following steps of: firstly constructing an integral frame structure, reserving floor joint bars, temporarily not pouring concrete slabs of a 0.00 m layer, a 3.90 m middle layer and a 7.90 m operation layer, additionally arranging a vertical rod in the middle of a bottom die in a frame beam construction die erecting process, when the concrete is not poured for 28 days, the side formworks are dismantled, the bottom formworks and the middle vertical rods are reserved, the bottom formworks and the vertical rods are dismantled after the concrete reaches the age, a high formwork support is directly erected from the ground for roof structure construction, and a roof is of a cast-in-place concrete slab combined structure of a steel beam and the bottom formwork with a profiled steel sheet. After the steel beam and the profiled steel sheet bottom die are installed, concrete is not poured temporarily, the high-support die frame is dismantled to vacate a crane installation space, the construction mode optimizes the using and dismantling process of the formwork, on the premise that the quality of a concrete structure is guaranteed, part of the formwork can be dismantled in advance, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of industrial plant construction, in particular to a rapid construction method for a steam turbine plant. Background Art

[0002] Currently, coastal regions are experiencing rapid industrial development, but limited land resources often necessitate the construction of new factories within existing industrial areas. This results in compact interior and exterior plant layouts, limited equipment lifting space and material transport channels, and insufficient space for lifting large building materials and equipment during main structure construction. To meet the demands of equipment lifting and material transportation during plant construction, cranes within the plant often need to be positioned as quickly as possible to improve the efficiency of horizontal and vertical transportation of equipment and materials, shorten construction schedules, and enable the plant to commence production as soon as possible, ultimately increasing economic benefits.

[0003] Generally, the installation of a crane within an industrial plant with a reinforced concrete structure as the main load-bearing component requires three prerequisites: the overall structure of the plant must be stable and meet the design strength requirements; the reinforced concrete crane beam supporting the crane track must meet the design strength requirements; and the crane track must be accurately installed. These prerequisites ensure the stable operation of the crane during installation and use.

[0004] To reduce construction time without sacrificing construction quality and structural safety, the hoisting conditions for plant crane installation must be considered from a structural design perspective. By optimizing the structural layout and construction sequence, vertical transportation channels for equipment and materials within the plant can be created. Using the crane within the turbine room to transport equipment awaiting installation within the plant improves crane utilization and reduces equipment installation time. Early commissioning of the crane reduces crane occupancy around the site, saving crane rental costs. Therefore, optimizing the structural layout and construction organization for crane hoisting is crucial.

[0005] In the prior art, patent publication number CN104131714A discloses a method for arranging the first span of a nuclear power plant turbine building. The first span includes one underground floor and six above-ground floors. The first span arranges mechanical equipment, electrical equipment, and ventilation equipment in the building in layers, and concentrates radioactive equipment in a radioactive control area. However, this comparative technology does not involve the construction method of the turbine building. The construction of a turbine building is very special because the turbine unit is very large and difficult to fit in, and high construction stability requirements are required. This comparative technology cannot solve this problem. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem of existing steam turbine plant buildings in that the hoisted units are very large and the units need to be placed while maintaining the structural stability of the plant building. The present invention temporarily does not install roof steel beams on one side of the roof, and adds 350×700mm frame beams on the 21.35m floor. The two sides of the frame beams remain beamless to provide space for the boom to move, so that a crane can enter to realize hoisting, thereby providing a rapid construction method for a steam turbine plant building.

[0007] Another object of the present invention is to solve the problem of slow construction of existing turbine powerhouses. During the formwork support process of frame beam construction, the present invention adds a vertical pole in the middle of the bottom formwork. The side formwork is removed and the bottom formwork and the middle vertical pole are retained before 28 days of concrete pouring. The bottom formwork and the vertical pole are removed after the concrete reaches the age, thereby providing a rapid construction method for a turbine powerhouse.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A rapid construction method for a steam turbine plant, comprising the following steps: S1, first constructing the overall frame structure, not considering the influence of the floor stiffness on the overall structure under the conditions permitted by the design calculation, reserving floor slab dowels and temporarily not pouring the concrete slabs of the 0.00m layer, the 3.90m middle layer and the 7.90m operating layer; S2, during the formwork support process for frame beam construction, adding vertical poles in the middle of the bottom formwork, removing the side formwork and retaining the bottom formwork and the middle vertical poles before 28 days of concrete pouring, and removing the bottom formwork and the vertical poles after the concrete reaches the age; S3, directly erecting a high-support formwork frame from the ground to construct the roof structure, the roof adopts a combined structure of steel beams and cast-in-place concrete slabs with corrugated steel plate bottom formworks, and after installing the steel beams and the corrugated steel plate bottom formwork, concrete is temporarily not poured, and the high-support formwork frame is removed to free up space for vehicle installation.

[0009] Preferably, in step S1, the concrete strength below the 7.90 m operating layer is C35, and the concrete strength above the 7.90 m operating layer is C45.

[0010] Preferably, the spacing between the vertical poles of the bottom formwork of the frame beam in step S2 is determined by structural calculation, and the bottom formwork and the vertical poles are retained before the concrete strength reaches 70% of the design value.

[0011] Preferably, in step S3, the roof steel beams and the corrugated steel plate bottom formwork form a self-supporting system, and the roof concrete slab is not poured when the high-support formwork is removed.

[0012] Preferably, in step S3, the crane is hoisted onto the track by a 130t truck crane installed in the northwest corner of the turbine room. The track is installed on the bracket. The center distance between the tracks on both sides is 21.7m. The elevation of the top of the rail is 18.15m. The roof steel beam is not installed on one side of the roof for the time being, and a 350×700mm frame beam is added at the 21.35m layer. The two sides of the frame beam remain beamless.

[0013] Preferably, the frame beam is connected to the adjacent structure by welding through embedded steel plates.

[0014] Preferably, after the crane installation is completed in step S3, the floor slabs and roof concrete slabs of each floor are poured simultaneously, and the floor slabs of each floor are constructed in parallel. After the concrete strength reaches the standard, a complete structural system is formed. Before pouring the roof concrete, the roof steel beams and secondary beams are installed first, and corrugated steel plates are laid as the bottom formwork.

[0015] As a preference, the crane track travel is 30m, and the track installation accuracy error is controlled within ±3mm. A 7m×13m crane transfer area is set up on the northeast side of the turbine house for temporary stacking and assembly of crane components.

[0016] As a preference, the floor slab casting adopts the skip-bin method, with the interval between adjacent casting areas being no less than 48 hours.

[0017] As a preference, during construction, the installed crane shall be used in conjunction with the tower crane to transport construction materials at the 3.90m and 7.90m levels. The rated load of the crane shall not be less than 1.2 times the weight of the maximum equipment in the turbine room.

[0018] Compared with the existing technology, the beneficial effects of the present invention are: by temporarily not installing the roof steel beams and adding frame beams at the 2-3 axis of the 21.35m floor, while keeping the frame beams in a beam-free state on both sides, the present invention provides sufficient space for the boom to move, allowing the crane to smoothly enter the factory building for lifting operations, effectively solving the problem of insufficient space in the existing turbine factory building when lifting huge units, ensuring the smooth progress of the lifting work, improving construction efficiency, and laying the foundation for the rapid construction of the turbine factory building.

[0019] During the formwork support process for frame beam construction, the present invention adds a vertical bar in the middle of the bottom formwork. Before 28 days of concrete pouring, the side formwork is removed, while the bottom formwork and the middle vertical bar are retained. The bottom formwork and the vertical bar are then removed after the concrete reaches the required age. This construction method optimizes the use and removal process of the formwork. While ensuring the quality of the concrete structure, some formwork can be removed in advance, speeding up the turnover of the formwork and shortening the construction period. This effectively solves the problem of slow construction speed in existing turbine powerhouses, enables rapid construction of the turbine powerhouse, and improves overall construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a framework diagram of the steam turbine plant of the present invention.

[0021] Figure 2 It is a schematic diagram of the roof beams of the steam turbine plant according to the present invention.

[0022] Figure 3 This is the structural layout diagram of the steam turbine plant of the present invention.

[0023] Figure 4 This is a schematic diagram of the high-support formwork construction of the present invention.

[0024] In the figure: 1. Corbel; 2. Frame beam; 3. Roof steel beam; 4. Crane; 5. Steam turbine; 6. Condensate pipe; 7. Air cooler; 8. Adjustable base; 9. Adjustable bracket; 10. Vertical pole; 11. Adjustable base; 12. Stairwell. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be further described below through specific embodiments in combination with the accompanying drawings. The described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Example 1: Reference Figures 1 to 4 A rapid construction method for a steam turbine building. In modern industrial construction, the efficiency of a steam turbine building plays a crucial role in the overall project progress. To achieve rapid construction while ensuring structural safety and stability, a rapid construction method for a steam turbine building is proposed. By optimizing construction steps and rationally arranging the construction sequence, this method effectively shortens the construction period while ensuring project quality.

[0027] This rapid construction method mainly includes the following key steps: focusing on the construction of the overall frame structure. Within the scope permitted by the design and calculation, the influence of the floor slab stiffness on the overall structure is not considered for the time being. Instead, the floor slab dowels are pre-set, and the concrete slabs of the 0.00m layer, the 3.90m intermediate layer, and the 7.90m operating layer are temporarily not poured. The core purpose of this approach is to simplify the construction process and speed up the construction progress in the early construction, creating more convenient conditions for subsequent construction operations. Moreover, by reserving floor slab dowels, effective connecting steel bars can be provided for the subsequent pouring of the floor slabs, ensuring a reliable connection between the floor slabs and the frame structure, thereby ensuring the safety and stability of the entire structure during later use. During the construction process, the dowels need to be arranged strictly according to the design requirements to ensure that the position of the dowels is accurate and the number is sufficient to meet the needs of subsequent construction.

[0028] When performing formwork support operations for frame beam construction, special attention should be paid to the middle position of the bottom formwork, and the support capacity of the bottom formwork should be enhanced by adding poles 10. When the concrete pouring is completed and less than 28 days have passed, the side formwork should be removed in time, but the bottom formwork and the middle poles 10 should still be retained. Such an operation can not only ensure the maintenance of the concrete in the early stages, but also release the side formwork resources in advance for the construction of other parts, improve the turnover rate of the formwork, and thus speed up the overall construction progress. Wait until the concrete reaches the age required by the design before removing the bottom formwork and the poles 10. During the dismantling process, operations must be carried out in strict accordance with relevant construction specifications and safety operating procedures to ensure the safety of construction personnel and the safety and stability of the structure. At the same time, in order to ensure the support effect of the poles 10, the selected pole materials need to be strictly quality inspected before construction to ensure that they have sufficient bearing capacity and rigidity.

[0029] Starting from the ground, a high formwork is directly erected for the construction of the roof structure. The roof structure adopts a combined structure of roof steel beams 3 and cast-in-place concrete slabs with corrugated steel plate bottom formwork. After installing the roof steel beams 3 and the corrugated steel plate bottom formwork, the concrete pouring operation is temporarily not carried out. Instead, the high formwork is first dismantled to free up the space required for the installation of the carriage 4. This construction method can reasonably arrange the construction sequence while ensuring the construction quality of the roof structure, so that the installation work of the carriage 4 can be carried out in advance, creating conditions for subsequent equipment transportation and other operations. When erecting the high formwork, the stability of the formwork must be ensured, and the vertical poles, horizontal poles and other components must be set according to the prescribed spacing and connection methods to ensure that they can withstand various loads that may occur during the construction process.

[0030] With the help of a 130t truck crane installed in the northwest corner of the turbine room, crane 4 was safely hoisted onto the designated track. The track was installed on bracket 1, with the center spacing of the tracks on both sides controlled to be 21.7m, and the rail top elevation set to 18.15m. As a key material transportation equipment within the factory, the quality and accuracy of the crane's installation directly affects the transportation efficiency and safety during subsequent construction and production. Therefore, during the hoisting and track installation process, high-precision measuring instruments and equipment such as total stations and levels are required to accurately measure and adjust the track installation position, elevation, and other parameters to ensure that the crane can operate smoothly after installation and meet the requirements of various equipment transportation.

[0031] After crane 4 was installed, the pouring of the floor slabs and roof concrete slabs began simultaneously, with each floor slab constructed in parallel to improve construction efficiency. Once the concrete strength reached the design standard, the entire structural system was completed, ensuring the integrity and safety of the factory building, enabling it to withstand the various loads and effects of use.

[0032] In step S1, the concrete strength grade for the area below the 7.90m operating floor is C35. This is because the concrete structure in this area meets the requirements in terms of load-bearing capacity and economic efficiency. The concrete strength grade for the area above the 7.90m operating floor is increased to C45. This is mainly due to the fact that the superstructure needs to withstand greater loads during use and possible adverse factors such as dynamic effects. Using higher-strength concrete can better ensure the safety and reliability of the structure and extend its service life.

[0033] In step S2, the spacing between the vertical poles 10 of the bottom formwork of the frame beam is determined after rigorous structural verification. This is to ensure that during the construction process, the support system of the bottom formwork can reliably withstand the various loads during the concrete pouring process, including the deadweight of the concrete, construction loads, and possible lateral pressure. At the same time, the bottom formwork and vertical poles 10 must be retained until the concrete strength reaches 70% of the design value. This is because before the early strength of the concrete is fully formed, the bottom formwork and vertical poles 10 play a vital supporting role. Premature removal may cause cracking, deformation and other problems in the frame beam structure, affecting the quality and safety of the structure.

[0034] In step S3, the self-supporting system formed by the roof steel beams 3 and the corrugated steel plate bottom formwork ensures the temporary stability of the roof structure while the high-support formwork is removed. Because the roof concrete slab has not yet been poured when the high-support formwork is removed, the self-supporting system must have sufficient load-bearing capacity and stability to ensure the safety of the roof structure before the subsequent concrete pouring.

[0035] In step S4, the roof steel beam 3 is not installed yet. Instead, a frame beam 2 measuring 350×700 mm is added at the 21.35m level. At the same time, the sides of the frame beam 2 remain free to provide space for the boom to move, facilitating the smooth entry and installation of the crane 4. This local adjustment mechanism fully considers the actual operational requirements of the construction process, optimizes the construction process, and improves construction efficiency.

[0036] The frame beam 2 is welded to the adjacent structure using pre-buried steel plates. This connection ensures the frame beam's load-bearing capacity and stability during the installation of the trolley 4, while also providing working space for the trolley 4 to be positioned. During the welding process, strict adherence to welding process requirements is required to ensure weld quality and strength, and to avoid welding defects that could lead to structural safety incidents.

[0037] In step S5, before pouring the roof concrete, the roof steel beams 3 and secondary beams of the A4 axis end span are installed, and corrugated steel sheets are laid as the bottom formwork. This operational process is designed to form a complete roof structure during the roof concrete pouring, ensuring the quality of the concrete pour and construction safety. Furthermore, by installing the roof steel beams 3 and secondary beams first, it provides reliable support for the corrugated steel sheet bottom formwork, ensuring the stability and rigidity of the bottom formwork during the concrete pouring process and preventing problems such as bottom formwork deformation that could affect the concrete pouring quality.

[0038] Example 2: Reference Figures 1 to 4 , 1. The overall frame structure is constructed first. Within the scope allowed by the design calculation, the construction team will not consider the impact of the floor stiffness on the overall structure for the time being. In the specific operation, the construction personnel pre-set the floor dowels, and temporarily do not pour the concrete slabs of the 0.00m layer, the 3.90m middle layer and the 7.90m operating layer. The significance of reserving floor dowels is to provide reliable connecting steel bars for the subsequent floor pouring, ensuring an effective connection between the floor and the frame structure. This connection plays a key role in ensuring the safety and stability of the entire structure in the later stage. During the construction process, the construction personnel must strictly arrange the dowels in accordance with the design requirements to ensure that their positions are accurate and the number is sufficient to fully meet the needs of subsequent construction.

[0039] When carrying out the formwork support operation for frame beam construction, the construction team paid special attention to the setting of the vertical pole 10. A vertical pole 10 was added in the middle of the bottom formwork to enhance the supporting capacity of the bottom formwork. When the concrete pouring was completed but less than 28 days later, the construction team promptly removed the side formwork, but the bottom formwork and the vertical pole 10 in the middle were still retained. This operating process not only ensures that the concrete can be fully cured in the early stages, but also realizes the early release of side formwork resources so that they can be used for construction in other parts. This measure effectively improves the turnover rate of the formwork, thereby speeding up the overall construction progress. The time to remove the bottom formwork and the vertical pole 10 is chosen after the concrete reaches the design age. During the dismantling process, construction personnel must strictly abide by relevant construction specifications and safety operating procedures to ensure operational safety and structural stability. In addition, in order to ensure that the vertical pole 10 can play a good supporting role, the vertical pole material must be strictly inspected for quality before construction to ensure that it has sufficient bearing capacity and rigidity.

[0040] The construction team erected high-support formwork directly from the ground to provide support for the roof structure construction. The roof structure adopts a combined structure of roof steel beams 3 and cast-in-place concrete slabs with corrugated steel plate bottom formwork. After the installation of the roof steel beams 3 and the corrugated steel plate bottom formwork, the concrete pouring operation is temporarily suspended. Instead, the high-support formwork is dismantled first to free up the space required for the installation of the carriage 4. This arrangement of the construction sequence allows the installation of the carriage 4 to be carried out in advance, which saves valuable time for subsequent equipment transportation and other operations. In the process of erecting the high-support formwork, the construction team must ensure the stability of the formwork. Vertical poles, horizontal bars and other components are set according to the specified spacing and connection methods to ensure that they can withstand various loads that may occur during the construction process. At the same time, construction personnel need to strictly inspect and accept the high-support formwork to ensure its safety and reliability.

[0041] Using a 130t truck crane installed in the northwest corner of the turbine building, the construction team safely hoisted crane 4 onto the designated track. The track was installed on bracket 1 of axle columns ① and ④. During construction, the center-to-center distance between the two tracks was strictly controlled to 21.7m, and the rail top elevation was set at 18.15m. As a crucial piece of material transportation equipment within the factory, the quality and accuracy of the crane's installation directly and critically impacts transportation efficiency and safety during subsequent construction and production. Therefore, during the hoisting and track installation process, the construction team employed high-precision measuring instruments and equipment, such as total stations and levels, to precisely measure and adjust parameters such as the track's installation position and elevation. These precise measurements and adjustments ensured the crane could operate smoothly after installation, meeting various equipment transportation requirements. The construction team also meticulously implemented safety measures during the hoisting process to ensure operational safety.

[0042] After the installation of crane 4 was completed, the construction team began the simultaneous pouring of the floor slabs and roof concrete slabs. Each floor slab was constructed in parallel to improve construction efficiency. During the construction process, the construction team strictly controlled the concrete mix ratio and pouring process to ensure the quality of the concrete. Once the concrete strength reached the design standard, the entire structural system was formed, ensuring the integrity and safety of the factory structure, enabling it to withstand various loads and various effects during use. After the concrete pouring was completed, the construction team also assigned a dedicated person to be responsible for maintenance to ensure the steady growth of the concrete strength.

[0043] In step S1, the concrete strength grade selected for the area below the 7.90m operating floor is C35. This selection is based on the fact that the concrete structure in this area meets the requirements in terms of load-bearing capacity and economy. The concrete strength grade above the 7.90m operating floor is increased to C45. This adjustment is primarily due to factors such as the greater loads the superstructure will need to withstand during use and potential unfavorable dynamic effects. Using higher-strength concrete can better ensure the safety and reliability of the structure and extend its service life. When purchasing concrete materials, the construction team strictly controls the quality of the materials to ensure that the concrete's performance meets the design requirements.

[0044] In step S2, the spacing of the vertical poles 10 of the bottom formwork of the frame beam is determined after rigorous structural verification. This rigorous verification process is intended to ensure that during the construction process, the support system of the bottom formwork can reliably withstand the various loads during the concrete pouring process. These loads include the deadweight of the concrete, construction loads, and possible lateral pressures. At the same time, the construction team must retain the bottom formwork and vertical poles 10 before the concrete strength reaches 70% of the design value. This is because the bottom formwork and vertical poles 10 play a vital supporting role before the early strength of the concrete is fully formed. Premature dismantling may cause cracking, deformation and other problems in the frame beam structure, which in turn affects the quality and safety of the structure. During the construction process, the construction team regularly monitors the load-bearing conditions of the vertical poles 10 to ensure structural safety.

[0045] In step S3, the self-supporting system formed by the roof steel beams 3 and the corrugated steel bottom formwork plays a key role in the removal of the high-support formwork. This system ensures the temporary stability of the roof structure. Because the roof concrete slab has not yet been poured when the high-support formwork is removed, the self-supporting system must have sufficient load-bearing capacity and stability. This ensures the safety of the roof structure before the subsequent concrete pouring. When installing the roof steel beams 3 and the corrugated steel bottom formwork, the construction team strictly controls the installation accuracy to ensure the stability and reliability of the self-supporting system.

[0046] In step S4, a frame beam 2 measuring 350 x 700 mm was added to the 21.35 m floor. At the same time, the sides of the frame beam 2 remained free to provide space for the boom's movement. This design addressed the space requirements during the installation of the crane 4. By implementing this localized structural adjustment, the construction team optimized the construction process, improved efficiency, and created favorable conditions for subsequent construction.

[0047] Frame beam 2 is welded to adjacent structures using pre-buried steel plates. This connection ensures the frame beam's load-bearing capacity and stability during the installation of crane 4 while also providing clearance for positioning. During the welding process, the construction team strictly adhered to welding procedures to ensure weld quality and strength. Strict welding quality control prevents welding defects that could lead to structural safety incidents. After welding, the construction team conducts nondestructive testing to ensure weld quality meets requirements.

[0048] In step S5, before pouring the roof concrete, the construction team first installs the roof steel beams 3 and secondary beams of the A4 axis end span, and lays corrugated steel plates as the bottom formwork. This operation process is arranged to form a complete roof structure system when the roof concrete is poured. The complete structural system can ensure the quality of concrete pouring and construction safety. At the same time, by first installing the roof steel beams 3 and secondary beams, reliable support is provided for the corrugated steel plate bottom formwork, ensuring the stability and rigidity of the bottom formwork during the concrete pouring process. During the installation process, the construction team strictly controls the installation accuracy of the roof steel beams 3 and secondary beams to prevent problems such as bottom formwork deformation from affecting the quality of concrete pouring.

[0049] Crane 4 has a travel range of 30 meters, ensuring a wide operating range within the factory and meeting the transportation and installation requirements of various equipment. During track installation, installation accuracy was strictly controlled to within ±3mm. This high-precision installation requirement was achieved through the use of advanced measurement technology and precise construction techniques, ensuring smooth and safe operation of the crane. A dedicated crane transfer area measuring 7m x 13m was established on the northeast side of the turbine building. This area is primarily used for the temporary storage and assembly of crane 4 components, providing ample space and convenient conditions for crane installation and commissioning.

[0050] The floor slab pouring process utilized the skip-bin method. This method, by rationally dividing the construction area and ensuring a minimum of 48 hours between adjacent pouring zones, effectively controlled concrete shrinkage and the occurrence of temperature cracks, ensuring the integrity and durability of the floor slab. During construction, the installed crane 4 was fully utilized in conjunction with the tower crane to transport construction materials for the 3.90m and 7.90m floors, significantly improving material transportation efficiency and reducing construction time. To ensure the crane's safety and reliability during transportation, its rated load was designed to be no less than 1.2 times the weight of the maximum equipment within turbine room 5. This design fully accounts for various adverse factors during equipment transportation and provides sufficient safety reserves for the construction process.

[0051] During construction, the air cooler 7 and the steam turbine 5 are placed first, ensuring the early installation of the main equipment and providing strong equipment support for subsequent construction. Finally, the condensate pipe 6 and other pipes are placed. This arrangement of the installation sequence fully considers the layout of the pipeline system and the connection relationship with other equipment, ensuring the coordination and efficiency of the entire system. During the high-support formwork construction process of the present invention, an adjustable base 8 and an adjustable bracket 9 are set, and a vertical pole 10 is set in the middle to support the roof steel beams and frame beams. An adjustable base 11 is also designed. These adjustable support structures can be flexibly adjusted according to the actual needs during the construction process, ensuring the stability and reliability of the formwork system. At the same time, a stairwell 12 is set on one side of the factory building to facilitate manual walking.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A rapid construction method for a steam turbine plant, characterized in that: The method includes the following steps: S1. First construct the overall frame structure. Under the conditions permitted by the design calculation, the influence of the floor stiffness on the overall structure is not considered. The floor dowels are reserved and the concrete slabs of the 0.00m layer, the 3.90m middle layer and the 7.90m operating layer are not poured for the time being; S2. During the formwork support process of the frame beam construction, a pole is added in the middle of the bottom formwork. The side formwork is removed and the bottom formwork and the middle pole are retained before 28 days of concrete pouring. The bottom formwork and the pole are removed after the concrete reaches the age; S3. The high-support formwork is directly erected from the ground for roof structure construction. The roof adopts a composite structure of steel beams and cast-in-place concrete slabs with corrugated steel plate bottom formwork. After the steel beams and the corrugated steel plate bottom formwork are installed, concrete is not poured for the time being, and the high-support formwork is removed to free up space for vehicle installation.

2. A rapid construction method for a steam turbine plant according to claim 1, characterized in that: In step S1, the concrete strength below the 7.90 m operating floor is C35, and the concrete strength above the 7.90 m operating floor is C45.

3. A rapid construction method for a steam turbine plant according to claim 1 or 2, characterized in that: The spacing between the vertical poles of the bottom formwork of the frame beam in step S2 is determined through structural calculation, and the bottom formwork and the vertical poles are retained before the concrete strength reaches 70% of the design value.

4. A rapid construction method for a steam turbine plant according to claim 1 or 2, characterized in that: In step S3, the roof steel beams and the corrugated steel plate bottom formwork form a self-supporting system, and the roof concrete slab is not poured when the high-support formwork is removed.

5. The rapid construction method for a steam turbine plant according to claim 1, characterized in that: In step S3, the crane is hoisted onto the track using a 130t truck crane installed in the northwest corner of the turbine room. The track is installed on the brackets. The center distance between the two tracks is 21.7m, and the rail top elevation is 18.15m. The roof steel beam is not installed on one side of the roof for the time being, and a 350×700mm frame beam is added at the 21.35m level. The two sides of the frame beam remain without beams.

6. A rapid construction method for a steam turbine plant according to claim 7, characterized in that: The frame beam is welded to the adjacent structure through embedded steel plates.

7. A rapid construction method for a steam turbine plant according to claim 6, characterized in that: After the crane is installed in step S3, the floor slabs and roof concrete slabs of each floor are poured simultaneously. The floor slabs of each floor are constructed in parallel. After the concrete strength reaches the standard, a complete structural system is formed. Before pouring the roof concrete, the roof steel beams and secondary beams are installed first, and corrugated steel plates are laid as the bottom formwork.

8. A rapid construction method for a steam turbine plant according to claim 1 or 7, characterized in that: The crane track travel is 30m, and the track installation accuracy error is controlled within ±3mm. A 7m×13m crane transfer area is set up on the northeast side of the turbine building for temporary stacking and assembly of crane components.

9. A rapid construction method for a steam turbine plant according to claim 1 or 7, characterized in that: The floor slab is poured using the skip-bin method, with the interval between adjacent pouring areas being no less than 48 hours.

10. A rapid construction method for a steam turbine plant according to claim 1 or 7, characterized in that: During the construction period, the installed crane will be used in conjunction with the tower crane to transport construction materials at the 3.90m and 7.90m levels. The rated load of the crane shall not be less than 1.2 times the weight of the maximum equipment in the turbine room.

Images