Construction method of an asp water tank support structure

Abstract

The application discloses a construction method of an ASP water tank support structure, and comprises the following steps: setting up a hanging frame on a hook; connecting the hanging frames to form an operation platform; prefabricating each truss in a prefabrication workshop; the truss comprises an upper chord horizontally arranged, a lower chord horizontally arranged and a diagonal brace arranged at the lower side of the lower chord; setting an assembling area near the safety shell; assembling two trusses in the assembling area to form a truss module; hoisting the truss modules to different positions outside the safety shell and connecting the truss modules with the embedded parts at the corresponding positions; and connecting any two adjacent truss modules with each other by using the operation platform to form the support structure. The construction method can effectively improve the construction quality, save the construction time, reduce the on-site construction procedures and the high-altitude operation time, thereby reducing the safety hidden danger.

Description

Technical Field

[0001] This invention relates to the field of steel structure construction technology, and in particular to a construction method for an ASP water tank support structure. Background Technology

[0002] The nuclear power plant's AS (Autoclave Regulator) system is a safety system that cools the nuclear reactor to prevent overheating. The ASP (Active Steam Layer) tank is part of the AS system and is primarily a water-rich device used to store predicted and safe energy. In the event of a safety accident, the ASP tank releases its stored water, generating a large amount of steam to absorb heat from the reactor, effectively slowing the temperature rise and ensuring the safety and stability of the nuclear power plant.

[0003] Besides the reactor control (AS) system, the containment vessel is another crucial safety structure in nuclear power plants. Located on the outermost layer of the reactor, it controls and limits the spread of radioactive materials from the reactor. The containment vessel is cylindrical or hemispherical, with the ASP (asphalt-supported) water tank typically surrounding and suspended on its outer side. However, because the ASP water tank is a reinforced concrete structure, its construction is challenging due to its considerable height and the unique shape of the containment vessel. Conventional support structures require high-altitude assembly and construction, posing significant safety hazards and requiring workers to operate at heights for extended periods. Summary of the Invention

[0004] The main objective of this invention is to provide a construction method for an ASP water tank support structure, aiming to solve the technical problems of high-altitude construction difficulty, long working time for construction personnel at height, and high safety hazards in the existing technology of ASP water tank support structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a construction method for an ASP (Anaerobic Asphalt) water tank support structure. The ASP water tank is arranged around the outside of the nuclear island containment vessel. Multiple spaced-apart embedded parts and multiple hooks are embedded on the outside of the containment vessel. The construction method for the ASP water tank support structure provided by this invention includes the following steps: erecting multiple hanging frames corresponding to the hooks; connecting the multiple hanging frames to form an operating platform; prefabricating each truss in a prefabrication workshop; each truss includes a horizontally arranged upper chord, a horizontally arranged lower chord, and diagonal braces located below the lower chord; setting up an assembly area near the containment vessel; assembling multiple trusses in pairs in the assembly area to form multiple truss modules; hoisting the multiple truss modules to different positions outside the containment vessel and connecting each truss module to the embedded parts at the corresponding positions; using the operating platform, connecting any two adjacent truss modules to form the support structure.

[0007] Optionally, the step of setting up an assembly area near the containment includes: selecting a preset area near the containment; leveling the ground of the preset area; laying steel plates on the leveled ground of the preset area; installing multiple rows of vertically arranged buttress columns on the steel plates; the multiple rows of buttress columns are arranged side by side, and a buttress area for supporting the truss is formed between each pair.

[0008] Optionally, after the step of installing multiple rows of vertically arranged buttresses on the steel plate, the method further includes: providing a top support on the top of each buttress; each top support facing the corresponding buttress area; and placing wooden blocks in each buttress area.

[0009] Optionally, the step of assembling multiple trusses in pairs in the assembly area to form multiple truss modules includes: taking two trusses as a group, hoisting a group of trusses into two adjacent buttress areas respectively; connecting the two trusses in the group to each other through side beams; installing a main beam aligned with the extension direction of the upper chord of each of the two trusses in the group; installing multiple secondary beams at intervals along the extension direction of the main beams on the upper part of the two main beams to form a truss module; repeating the above steps to form multiple truss modules.

[0010] Optionally, the side beam includes an upper chord side beam and a lower chord side beam; the step of connecting two trusses in a group to each other via the side beams includes: installing a plurality of lower chord side beams spaced apart along the extension direction of the lower chord between the lower chord members of the two trusses in the group, so as to connect the two lower chord members via the lower chord side beams; and installing a plurality of upper chord side beams spaced apart along the extension direction of the upper chord between the upper chord members of the two trusses in the group, so as to connect the two upper chord members via the upper chord side beams.

[0011] Optionally, the step of connecting any two adjacent truss modules to form the support structure using the operating platform includes: connecting two adjacent lower chord members of two adjacent truss modules that are close to each other through the lower chord side beam; connecting two adjacent upper chord members of two adjacent truss modules that are close to each other through the upper chord side beam; and erecting a plurality of secondary beams that are spaced apart along the extension direction of the main beams on two adjacent main beams of two adjacent truss modules.

[0012] Optionally, after the step of connecting two adjacent lower chord members in two adjacent truss modules via the lower chord side beams, the method further includes: laying steel planks on the multiple lower chord side beams to form a lower construction platform; installing guardrails and safety nets on the side of the lower construction platform away from the containment structure; after the step of erecting multiple secondary beams on two adjacent main beams in two adjacent truss modules, the method proposed in this invention further includes: removing the guardrails and safety nets; and dismantling the lower construction platform.

[0013] Optionally, the embedded part corresponding to the upper chord is an upper chord embedded part, the embedded part corresponding to the lower chord is a lower chord embedded part, and the embedded part corresponding to the diagonal brace is a diagonal brace embedded part; the step of hoisting the plurality of truss modules to different positions outside the containment and connecting each truss module to the embedded part at the corresponding position includes: hoisting each truss module to different positions outside the containment; connecting the lower chord to the lower chord embedded part at the corresponding position; connecting the upper chord to the upper chord embedded part at the corresponding position; and connecting the diagonal brace to the diagonal brace embedded part at the corresponding position.

[0014] Optionally, the step of connecting the diagonal brace to the corresponding embedded part of the diagonal brace includes: determining the installation position of the first connecting plate according to the position of the diagonal brace; removing the diagonal brace from the truss; welding the first connecting plate to the embedded part of the diagonal brace; temporarily installing the diagonal brace to the embedded part of the diagonal brace using high-strength bolts, and determining the installation position of the second connecting plate according to the position of the diagonal brace; welding the second connecting plate to the embedded part of the diagonal brace; welding the second connecting plate and the first connecting plate to both sides of the embedded part of the diagonal brace respectively; welding both sides of the diagonal brace to the first connecting plate and the second connecting plate respectively; and tightening the high-strength bolts to securely connect the diagonal brace to the embedded part of the diagonal brace.

[0015] Optionally, before the step of hoisting each truss module to different positions outside the containment, the method further includes: welding a corbel support extending away from the containment onto each of the lower chord embedded members; after the step of hoisting each truss module to different positions outside the containment, the method further includes: erecting each of the truss modules on the corbel support connected to the lower chord embedded member at the corresponding position; and connecting each of the lower chord members to the erected corbel support.

[0016] The construction method for the ASP water tank support structure proposed in this invention involves prefabricating multiple trusses to form the support structure in a prefabrication workshop. These trusses are then assembled in pairs on the ground to form multiple truss modules. Construction workers only need to sequentially hoist these modules into position and connect them to corresponding embedded parts, and then connect the modules to each other to complete the support structure construction. The trusses can be centrally fabricated in the prefabrication workshop, and their structural design can be tailored to the weight and bottom shape of the ASP water tank, enabling standardized truss production, ensuring truss quality, and improving construction quality. The trusses are prefabricated in the factory and can be pre-assembled into truss modules. The fabrication of these modules does not conflict with the construction of the main containment structure, effectively saving construction time. The fabrication of each truss module is completed on the ground. Construction workers only need to connect the hoisted truss modules to the embedded parts and connect the modules to each other. This reduces the number of construction steps, effectively lowers construction difficulty, and significantly reduces the time spent by construction workers working at height, thereby reducing safety hazards. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the first embodiment of the ASP water tank truss construction method of the present invention;

[0019] Figure 2 for Figure 1 A detailed flowchart of step S40;

[0020] Figure 3 for Figure 1 A detailed flowchart of step S50;

[0021] Figure 4 for Figure 1 A detailed flowchart of step S60;

[0022] Figure 5 for Figure 1 A detailed flowchart of step S70;

[0023] Figure 6 for Figure 4 A detailed flowchart of step S64;

[0024] Figure 7 This is a side view schematic diagram of an embodiment of the ASP water tank truss of the present invention;

[0025] Figure 8 This is a top view schematic diagram of an embodiment of the ASP water tank truss of the present invention;

[0026] Figure 9 This is a schematic diagram of the assembly area of ​​an embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of a structure of an embodiment of the hanger of the present invention.

[0028] Explanation of icon numbers:

[0029]

[0030]

[0031] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0033] It should be noted that in the embodiments of the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] In this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element. Furthermore, the meaning of "and / or" throughout the text includes three parallel options; for example, "A and / or B" includes option A, option B, or options where both A and B are satisfied.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements.

[0036] In this invention, if there are descriptions involving "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0037] In this invention, the use of suffixes such as "module," "component," "part," "unit," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" can be used interchangeably.

[0038] For those skilled in the art, the specific meanings of the above terms in this invention can be understood according to the specific circumstances. Furthermore, the technical solutions of the various embodiments can be combined with each other; however, this is based on the premise that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] The inventive concept of the present invention will be further explained below with reference to some specific embodiments.

[0040] This invention proposes a construction method for an ASP water tank support structure, wherein the ASP water tank is installed around the outside of the nuclear island containment vessel, and multiple spaced embedded parts and multiple hooks are embedded on the outside of the containment vessel.

[0041] like Figure 1 As shown, Figure 1 This is a flowchart illustrating the first embodiment of the ASP water tank truss construction method of the present invention. The construction method proposed in this invention includes the following steps:

[0042] Step S10: Install multiple hanging racks on the multiple hooks one-to-one;

[0043] Step S20: Connect the multiple hanging brackets to each other to form an operating platform;

[0044] Step S30: Prefabricate each truss in the prefabrication workshop; the truss includes a horizontally arranged upper chord, a horizontally arranged lower chord, and a diagonal brace arranged on the lower side of the lower chord;

[0045] Step S40: Set up an assembly area near the containment vessel;

[0046] Step S50: Assemble multiple trusses in pairs in the assembly area to form multiple truss modules;

[0047] Step S60: Hoist the multiple truss modules to different positions outside the containment structure, and connect each truss module to the embedded part at the corresponding position;

[0048] Step S70: Using the operating platform, connect any two adjacent truss modules to form the support structure.

[0049] like Figure 7 , Figure 8 and Figure 10 As shown, Figure 7 This is a side view schematic diagram of an embodiment of the ASP water tank truss of the present invention; Figure 8 This is a top view schematic diagram of an embodiment of the ASP water tank truss of the present invention; Figure 10 This is a schematic diagram of a structure of a hanging bracket according to an embodiment of the present invention; the hook 90 and the embedded part 50 are both embedded in the safety shell 70, and the hook 90 is located below the embedded part 50. The hanging bracket 91 is connected to the safety shell 70 through the hook 90. ​​The hanging bracket 91 extends upward from the hook 90 to the position of the embedded part 50. Multiple hanging brackets 91 are connected to each other to form an operating platform. The operating platform has hoisting channels at the preset installation positions of each truss module 10. After the operating platform is erected, the assembled truss modules 10 are hoisted into the hoisting channels. The hoisting channels extend outward from the containment vessel 70, so that the inner side of each truss module 10 is connected to the containment vessel 70 and the outer side extends away from the containment vessel 70. After each truss module 10 is hoisted into place, the construction personnel on the operating platform connect the truss modules 10 to the corresponding embedded parts 50. After all truss modules 10 are fixedly connected to the containment vessel 70, multiple truss modules 10 are connected to each other to form an integrated support structure. The top surface of the support structure forms a support platform for supporting the ASP water tank. Finally, the operating platform is dismantled.

[0050] The construction method for the ASP water tank support structure proposed in this invention involves prefabricating multiple trusses 10 to form the support structure in a prefabrication workshop. These trusses 10 are then assembled in pairs on the ground to form multiple truss 10 modules. Construction workers only need to hoist these modules sequentially into place and connect them to the corresponding embedded parts 50, and then connect the modules together to complete the support structure construction. The trusses 10 can be centrally processed in the prefabrication workshop. The trusses 10 can be structurally configured according to the weight and bottom shape of the ASP water tank, enabling standardized production and ensuring their quality, thus improving construction quality. The prefabrication of the trusses 10 in the factory and their pre-assembly into truss 10 modules does not conflict with the construction of the main structure of the containment vessel 70, effectively saving construction time. The fabrication of each truss module 10 is completed on the ground. Construction workers only need to connect the hoisted truss module 10 to the embedded part 50 and connect the truss modules 10 to each other. The on-site construction process is reduced, which effectively reduces the construction difficulty and significantly reduces the time that construction workers spend working at height, thereby reducing safety hazards.

[0051] Based on the first embodiment, step S40 includes:

[0052] Step S41: Select a preset area near the containment vessel;

[0053] Step S42: Level the ground in the preset area;

[0054] Step S43: Lay steel plates on the leveled ground of the preset area;

[0055] Step S44: Install multiple rows of vertically arranged buttress columns on the steel plate; the multiple rows of buttress columns are arranged side by side, and a buttress area for supporting the truss is formed between each pair.

[0056] like Figure 2 and Figure 9 As shown, Figure 2 for Figure 1 A detailed flowchart of step S40; Figure 9 This is a schematic diagram of the assembly area according to an embodiment of the present invention. The assembly area is located on the ground near the containment vessel 70. The ground of the assembly area is leveled by excavation, backfilling, and hardening with concrete. Steel plates are then laid on the concrete ground to ensure that the steel plates are placed horizontally. This ensures that when the truss 10 is placed on the steel plates, the height of adjacent trusses 10 is consistent, keeping the top surface of the truss 10 module horizontal. The width of each buttress area 41 is slightly larger than the width of the truss 10, allowing the truss 10 to be smoothly hoisted into the buttress area 41. The buttress columns 40 on both sides of the buttress area 41 provide support for both sides of the truss 10, keeping the truss 10 vertically positioned.

[0057] In one embodiment, after step S44, the method further includes:

[0058] Step S45: Install a top support on the top of each of the buttress columns; each top support faces the corresponding buttress area;

[0059] Step S46: Place wooden blocks in each of the buttress areas.

[0060] Furthermore, to ensure the truss 10 can be smoothly hoisted into the buttress area 41, the width of the buttress area 41 is greater than the width of the truss 10. Top supports 42 are installed at the top of the buttress columns 40. Multiple top supports 42 on both sides of the buttress columns 40 clamp and fix the truss 10, effectively preventing the truss 10 from tilting within the buttress area 41 and preventing direct contact and wear between the truss 10 and the buttress columns 40. The width of the wooden blocks 43 at the bottom of the buttress area 41 is equal to the width of the buttress area 41, allowing the truss 10 to be placed on the wooden blocks 43, preventing direct contact and damage between the truss 10 and the steel plate. The top supports 42 and wooden blocks 43 effectively protect the truss 10, maintaining its integrity during hoisting and processing.

[0061] Based on the first embodiment, step S50 includes:

[0062] Step S51: Using two trusses as a group, hoist one group of trusses into two adjacent buttress areas respectively;

[0063] Step S52: Connect two of the trusses in a set to each other using side beams;

[0064] Step S53: Install a main beam aligned with the extension direction of the upper chord of each of the two upper chords in the group;

[0065] Step S54: Install multiple secondary beams at intervals along the extension direction of the two main beams on the upper part of the two main beams to form a truss module;

[0066] Step S55: Repeat the above steps to form multiple truss modules. That is, repeat steps S51 to S54 until all the truss modules are assembled.

[0067] like Figure 3 As shown, Figure 3 for Figure 1A detailed flowchart of step S50 is shown below. The truss 10 module includes two trusses 10, a side beam connecting the two trusses 10, a main beam 20 on each truss 10, and a secondary beam 30 connecting the two main beams 20. The two ends of the side beams are welded to two adjacent trusses 10, and the two ends of each secondary beam 30 are also welded to two adjacent main beams 20. Multiple buttress columns 40 are spaced apart on one side of the buttress area 41, and the buttress columns 40 avoid the connection positions of the side beams and secondary beams 30 on the trusses 10. When the construction workers weld the side beams and secondary beams 30 on the trusses 10, the buttress columns 40 can clamp the trusses 10 to keep the trusses 10 fixed.

[0068] In one embodiment, the side beam includes an upper chord side beam and a lower chord side beam;

[0069] Step S52 includes:

[0070] Step S521: Install a plurality of lower chord side beams spaced apart along the extension direction of the lower chord between the lower chord members of two trusses in a group, so as to connect the two lower chord members through the lower chord side beams;

[0071] Step S522: Install a plurality of upper chord side beams spaced apart along the extension direction of the upper chord between the upper chord members of two trusses in a group, so as to connect the two upper chord members through the upper chord side beams.

[0072] Due to the high height of the supporting structure, the truss module 10 will be subjected to large lateral wind loads and may also be subjected to lateral seismic loads. By setting the upper chord side beam 61 to support the upper chord members 11 of the two adjacent trusses 10, and setting the lower chord side beam 62 to support the lower chord members 12 of the two adjacent trusses 10, the lateral forces on the truss module 10 can be resisted, thereby increasing the wind and earthquake resistance of the supporting structure.

[0073] Based on the first embodiment, step S70 includes:

[0074] Step S71: Connect two adjacent lower chord members of two adjacent truss modules through the lower chord side beam;

[0075] Step S72: Connect two adjacent upper chord members of two adjacent truss modules through the upper chord side beam;

[0076] Step S73: On two main beams that are close to each other in two adjacent truss modules, a plurality of secondary beams are erected at intervals along the extension direction of the main beams.

[0077] like Figure 5 As shown, Figure 5 for Figure 1A detailed flowchart of step S70 is shown below. Similarly, adjacent truss modules 10 are connected by multiple upper chord side beams 61 and multiple lower chord side beams 62, and multiple secondary beams 30 overlap between two main beams 20 that are close to each other in adjacent truss modules 10. The welding positions of the upper chord side beams 61 and lower chord side beams 62 between adjacent truss modules 10 correspond to the positions of the upper chord side beams 61 and lower chord side beams 62 within the truss module 10, making the lateral force transmission path within the support structure more direct. Each truss module 10 can better bear the force of adjacent truss modules 10, making the support structure a unified load-bearing structure and effectively improving the lateral compressive strength of the support structure.

[0078] In one embodiment, after step S71, the method further includes:

[0079] Step S711: Lay steel planks on the multiple lower chord side beams to form a lower construction platform;

[0080] Step S712: Install guardrails and safety nets on the side of the lower construction platform away from the safety shell;

[0081] Following step S73, the method further includes:

[0082] Step S74: Remove the guardrail and the protective netting;

[0083] Step S75: Remove the lower construction platform.

[0084] It should be noted that, to facilitate the hoisting of truss modules 10, the operating platform has hoisting channels corresponding to the positions of each truss module 10. The operating platform is located below each truss module 10 and can only be used for welding the lower chord side beams 62 between multiple truss modules 10. After the welding of the multiple spaced lower chord side beams 62 is completed, steel scaffolding is laid on the lower chord side beams 62 to fill the gaps between them, forming a lower construction platform. This facilitates the welding of the upper chord side beams 61 between the truss modules 10, effectively ensuring the safety of welding personnel. Simultaneously, vertical guardrails are installed on the outside of the lower construction platform, and safety nets are installed between the gaps in the guardrails, creating a closed space on the lower construction platform to further ensure the safety of construction personnel.

[0085] Based on the first embodiment, the embedded part corresponding to the upper chord is the upper chord embedded part, the embedded part corresponding to the lower chord is the lower chord embedded part, and the embedded part corresponding to the diagonal brace is the diagonal brace embedded part.

[0086] Step S60 includes:

[0087] Step S61: Hoist each truss module to a different position outside the containment structure;

[0088] Step S62: Connect the lower chord to the lower chord embedded part at the corresponding position;

[0089] Step S63: Connect the upper chord to the upper chord embedded part at the corresponding position;

[0090] Step S64: Connect the diagonal brace to the diagonal brace embedded part at the corresponding position.

[0091] like Figure 4 and Figure 7 As shown, Figure 4 for Figure 1 A detailed flowchart of step S60 is shown below. Each truss 10 is connected to the outside of the containment 70 via a lower chord embedded part 52, an upper chord embedded part 51, and a diagonal brace embedded part 53. The upper chord embedded part 51 is connected to the upper chord member 11, which directly bears the ASP water tank load. Therefore, the size of the upper chord embedded part 51 is larger than that of the lower chord embedded part 52 and the diagonal brace embedded part 53, resulting in higher structural strength and a greater connection force between the upper chord embedded part 51 and the containment 70, thus ensuring a stable connection of the upper chord member 11. First, the lower chord member 12 of the truss 10 is connected to the lower chord embedded part 52 to initially position and fix the truss 10. Then, the upper chord member 11 is tightened to the upper chord embedded part 51, so that the upper chord embedded part 51 pulls the truss 10 taut, thereby reducing the stress on the lower chord embedded part 52, making the stress on the truss 10 more reasonable, and facilitating construction.

[0092] In one embodiment, step S64 includes:

[0093] Step S641: Determine the installation position of the first connecting plate based on the position of the diagonal brace;

[0094] Step S642: Remove the diagonal brace from the truss;

[0095] Step S643: Weld the first connecting plate to the diagonal brace embedded part;

[0096] Step S644: Temporarily install the diagonal brace onto the diagonal brace embedded part using high-strength bolts, and determine the installation position of the second connecting plate according to the position of the diagonal brace;

[0097] Step S645: Weld the second connecting plate to the diagonal brace embedded part; the second connecting plate and the first connecting plate are respectively welded to both sides of the diagonal brace embedded part;

[0098] Step S646: Weld both sides of the diagonal brace to the first connecting plate and the second connecting plate respectively;

[0099] Step S647: Tighten the high-strength bolts to secure the diagonal brace to the diagonal brace embedded part.

[0100] like Figure 6As shown, Figure 6 for Figure 4 A detailed flowchart of step S64 is shown below. After connecting the upper chord 11 and the lower chord 12 to the upper chord embedded part 51 and the lower chord embedded part 52 respectively, the truss 10 is finally fastened to the containment 70 by connecting the diagonal brace to the diagonal brace embedded part 53. The diagonal brace mainly bears the pressure. In addition to setting multiple high-strength bolts, the diagonal brace and the diagonal brace embedded part 53 are connected by a first connecting plate and a second connecting plate on both sides of the diagonal brace. The first connecting plate and the second connecting plate are both connected to the diagonal brace embedded part 53 to enhance the compressive strength at the connection node between the diagonal brace and the diagonal brace embedded part 53, thereby improving the connection stability of each truss 10.

[0101] When connecting the diagonal brace to the diagonal brace embedded part 53, the diagonal brace is first temporarily connected to the diagonal brace embedded part 53 by high-strength bolts. The positions of the first connecting plate and the second connecting plate are determined by the position of the diagonal brace. Then, the first connecting plate and the second connecting plate are welded and fixed, so that the first connecting plate and the second connecting plate serve as the main pressure-bearing components. Finally, the high-strength bolts are tightened, so that the high-strength bolts serve as the main tension-bearing components, giving full play to the load-bearing performance of the components, thereby improving the load-bearing capacity and connection stability of the diagonal brace and the diagonal brace embedded part 53.

[0102] In one embodiment, prior to step S61, the method further includes:

[0103] Step S609: Weld a corbel support extending away from the containment structure onto each of the lower chord embedded parts;

[0104] Following step S61, the method further includes:

[0105] Step S611: Erect each of the truss modules on the corbel support connected to the lower chord embedded part at the corresponding position;

[0106] Step S612: Connect each of the lower chords to the corbel support it is erected with.

[0107] Before connecting the lower chord 12 of truss 10 to the lower chord embedded part 52, truss 10 is temporarily placed on the corbel support. This ensures that the lower chord embedded part 52 is not subjected to stress during the connection process and prevents truss 10 from swaying, effectively guaranteeing construction quality. Simultaneously, the connection between the lower chord 12 and the corbel support further increases the connection force between truss 10 and containment 70, making the connection between each truss 10 and containment 70 more secure.

[0108] It should be noted that the sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above embodiments are only optional embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made under the inventive concept of the present invention using the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are all included within the patent protection scope of the present invention.

Claims

1. A construction method for an ASP water tank support structure, wherein the ASP water tank is arranged around the outside of the nuclear island containment vessel, and the outside of the containment vessel is provided with a plurality of spaced-apart embedded parts and a plurality of hooks, characterized in that, The method includes: Multiple hanging racks are installed on the hooks in a one-to-one correspondence; Multiple of the aforementioned racks are interconnected to form an operating platform; The prefabrication of each truss is carried out in the prefabrication workshop; the truss includes a horizontally arranged upper chord, a horizontally arranged lower chord, and a diagonal brace arranged on the lower side of the lower chord. An assembly area is set up near the containment vessel; In the assembly area, multiple trusses are assembled in pairs to form multiple truss modules; Multiple truss modules are hoisted to different positions outside the containment, and each truss module is connected to the embedded part at the corresponding position. Using the operating platform, any two adjacent truss modules can be connected to each other to form the support structure; The step of setting up an assembly area near the containment vessel includes: Select a predetermined area near the containment vessel; Level the ground in the preset area; Steel plates are laid on the leveled ground of the predetermined area; Multiple rows of vertically arranged buttress columns are installed on the steel plate; the multiple rows of buttress columns are arranged side by side, and a buttress area for supporting the truss is formed between each pair of them.

2. The construction method of the ASP water tank support structure as described in claim 1, characterized in that, After the step of installing multiple rows of vertically arranged buttress columns on the steel plate, the method further includes: A top support is provided at the top of each of the buttress columns; each top support faces the corresponding buttress area. Wooden blocks are placed in each of the aforementioned buttress areas.

3. The construction method of the ASP water tank support structure as described in claim 1, characterized in that, The step of assembling multiple trusses in pairs in the assembly area to form multiple truss modules includes: Two trusses are grouped together, and one group of trusses is hoisted into two adjacent buttress areas respectively; Two of the trusses in a set are connected to each other by side beams; A main beam aligned with the extension direction of the upper chord is installed on the upper portion of the upper chord of each of the two trusses in the group; Multiple secondary beams are installed at intervals along the extension direction of the two main beams on the upper part of the two main beams to form a truss module. Repeat the above steps to form multiple truss modules.

4. The construction method of the ASP water tank support structure as described in claim 3, characterized in that, The side beam includes an upper chord side beam and a lower chord side beam; The step of connecting two of the trusses in a group to each other via side beams includes: A plurality of lower chord side beams, spaced apart along the extension direction of the lower chord, are installed between the lower chord members of two trusses in a group to connect the two lower chord members via the lower chord side beams; A plurality of upper chord side beams, spaced apart along the extension direction of the upper chord, are installed between the upper chord members of two trusses in a group to connect the two upper chord members.

5. The construction method of the ASP water tank support structure as described in claim 4, characterized in that, The step of connecting any two adjacent truss modules to form the support structure using the operating platform includes: Two adjacent lower chord members in two adjacent truss modules are connected by the lower chord side beam; Two adjacent upper chord members in two adjacent truss modules are connected by the upper chord side beam; Multiple secondary beams, spaced apart along the extension direction of the main beams, are erected on two main beams that are close to each other in two adjacent truss modules.

6. The construction method of the ASP water tank support structure as described in claim 5, characterized in that, After the step of connecting two adjacent lower chord members in two adjacent truss modules via the lower chord side beam, the method further includes: Steel planks are laid on multiple lower chord side beams to form a lower construction platform; A protective railing and safety net are installed on the side of the lower construction platform away from the safety shell; After the step of erecting multiple secondary beams on two main beams that are close to each other in two adjacent truss modules, the method further includes: Remove the guardrails and the protective netting; The lower construction platform was dismantled.

7. The construction method of the ASP water tank support structure as described in any one of claims 1-6, characterized in that, The embedded part corresponding to the upper chord is the upper chord embedded part, the embedded part corresponding to the lower chord is the lower chord embedded part, and the embedded part corresponding to the diagonal brace is the diagonal brace embedded part; The step of hoisting the plurality of truss modules to different positions outside the containment structure and connecting each truss module to the embedded part at the corresponding position includes: Each truss module was hoisted to a different position outside the containment structure; Connect the lower chord to the lower chord embedded part at the corresponding position; Connect the upper chord to the upper chord embedded part at the corresponding position; Connect the diagonal brace to the corresponding embedded part of the diagonal brace.

8. The construction method of the ASP water tank support structure as described in claim 7, characterized in that, The step of connecting the diagonal brace to the corresponding embedded part of the diagonal brace includes: The installation position of the first connecting plate is determined based on the position of the diagonal brace; Remove the diagonal brace from the truss; The first connecting plate is welded to the diagonal brace embedded part; The diagonal brace is temporarily installed on the diagonal brace embedded part using high-strength bolts, and the installation position of the second connecting plate is determined according to the position of the diagonal brace. The second connecting plate is welded to the diagonal brace embedded part; the second connecting plate and the first connecting plate are respectively welded to both sides of the diagonal brace embedded part; The two sides of the diagonal brace are welded to the first connecting plate and the second connecting plate, respectively; Tighten the high-strength bolts to secure the diagonal brace to the diagonal brace embedded part.

9. The construction method of the ASP water tank support structure as described in claim 7, characterized in that, Prior to the step of hoisting each truss module to different positions outside the containment vessel, the method further includes: Weld a corbel support extending away from the containment structure onto each of the lower chord embedded parts; After the step of hoisting each truss module to different positions outside the containment vessel, the method further includes: Each of the truss modules is erected on the corbel support connected to the lower chord embedded part at the corresponding position; Each of the lower chord members is connected to the corbel support it is erected with.

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