Steel bar integrated profile steel connecting device suitable for nuclear island and construction method

Abstract

The invention discloses a steel bar integrated profile steel connecting device suitable for a nuclear island and a construction method, and belongs to the technical field of steel bar integrated assembly. The steel bar integrated profile steel connecting device comprises a prefabricated steel bar cage, the prefabricated steel bar cage is composed of a plurality of layers of steel bar meshes, and steel bar trusses are arranged between the adjacent layers of steel bar meshes; c-shaped steel or H-shaped steel is welded and fixed at the end part of the prefabricated reinforcement cage; when the adjacent prefabricated reinforcement cages are connected, the two pieces of C-shaped steel or H-shaped steel of the same size between the adjacent ends are in butt joint and are fixed through bolt connection or welding. Steel bar meshes on the upper layer and the lower layer are in lap joint and welding with C-shaped steel or H-shaped steel at the ends of the prefabricated steel bar cages, the C-shaped steel or the H-shaped steel at the ends of the two same prefabricated steel bar cages is connected, steel bars between the adjacent steel bar cages are rapidly positioned and connected, equal-strength connection of the steel bars is achieved, and the problem that horizontal steel bars cannot be aligned is solved. On-site workload is reduced, and construction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of integrated steel bar assembly, and in particular relates to a steel section connection device and a construction method for integrated steel bars suitable for a nuclear island. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In nuclear power plants, since the plant structure is relatively irregular and the wall panels are relatively thick, if the traditional civilian prefabricated structure is adopted, the weight of the prefabricated components is relatively large, and very high requirements are placed on the hoisting. In addition, the layout of nuclear power plant buildings is generally relatively compact, and the hoisting area and hoisting capacity of the hoisting equipment are generally limited. Therefore, the use of traditional prefabrication in nuclear power plants has great limitations. In current nuclear power plants, such as CAP1000, CAP1400 and other reactor types, a large number of modular design concepts and construction methods are adopted, but the current module construction and installation prices are relatively high, and the economy is generally average when mass production is not possible.

[0004] To solve the above problems, nuclear power plants use integrated steel bar assembly, which is the best choice to improve construction efficiency and construction economy. It overcomes the shortcomings of prefabricated buildings and modular construction, and has the advantages of both. Integrated steel bar assembly construction is to move the steel bars and installed items tied on site to the processing plant for processing and manufacturing, realizing integrated construction such as overall transportation, hoisting, and installation, and integrating the advantages of prefabrication and modularization. On the one hand, it embodies the modular construction concept and can speed up the construction progress. On the other hand, it is relatively light in weight, which is conducive to hoisting control and reduces the requirements for hoisting sites and equipment.

[0005] The integrated steel bar assembly technology is widely used in municipal and civil projects. It is also a mature technology in projects such as underground continuous walls, pile foundations, roads, bridges (including viaducts) of high-rise buildings. However, in the integrated assembly of steel bars, mechanical joints are usually considered to connect the steel bars. When the supporting steel bars are offset, the construction workers are required to hit the steel bars with a hammer. The deviation caused by the mechanical joint connection will also cause the steel mesh to have a vertical deviation. At the same time, the diameter of the steel bars in the floors and walls of nuclear power plants is often large. During the overall binding and hoisting of the steel bars, the steel mesh will be deformed under the action of its own weight. The horizontal steel bars of two adjacent steel meshes are connected by mechanical connectors. The vertical deviation and deformation of the steel bars will cause the elevation of the horizontal steel bars in the steel mesh to be unable to align, resulting in difficulties in connection.

[0006] To solve the above problems, patent CN214461820U discloses a frame column steel cage assembly connection device, which connects the first steel cage and the second steel cage through a number of steel bar fixing structures, and uses bolts and clips to make the steel cage more stable as a whole. However, this cannot solve the problem of rapid positioning between the two steel cages, especially for large-area flat floor steel cages.

[0007] Patent CN116892273A discloses a connection device for connecting steel cages, which aligns the main steel bars of two steel cages by setting a main component and an alignment component, so that the threaded sleeve can connect the two steel cages. However, this connection auxiliary device is only applicable to the connection of cylindrical steel cages, and cannot be applied to the connection of a large number of horizontal and vertical double-layer steel cage meshes in the nuclear island.

[0008] Patent CN105952062A discloses a prefabricated floor steel cage connection component, which is assembled by installing detachable pre-assembled movable steel bars temporarily fixed in the steel truss and connecting it with other steel cage components. The pre-assembled movable steel bars can be inserted into the mechanical joint horizontally after disassembly. However, the larger diameter of the steel bars in the nuclear island will cause the space occupied by the mechanical joint to increase, increasing the difficulty of construction.

[0009] Patent CN117905491A discloses a secondary lining steel cage assembly support system and method for underground tunnels, in which two adjacent steel cage sections are connected by an automatic positioning flange node. However, fixing the steel bars one by one on the flange requires the steel bars on both sides of the two flanges to correspond one by one, which requires too high precision, and the flange and the steel bars cannot form an equal strength connection, and the strength of the connection cannot be guaranteed.

[0010] In summary, there is an urgent need for an integrated steel connection device suitable for a nuclear island, which can not only realize the rapid positioning and connection of steel bars between adjacent steel cages, but also ensure the strength of the connection nodes and increase the overall strength. Summary of the invention

[0011] In view of the above problems, the present invention provides an integrated steel connection device and construction method suitable for a nuclear island, which can realize rapid positioning and connection of steel bars between adjacent steel cages, and can also ensure the strength of the connection nodes and increase the overall strength.

[0012] To achieve the above object, the present invention adopts the following technical solutions:

[0013] In a first aspect, a steel connection device for a nuclear island with integrated steel bars is provided, which is used to connect and fix two prefabricated steel cages, including a C-shaped steel welded and fixed to the ends of the prefabricated steel cages; the upper and lower sides of the web of the C-shaped steel are respectively connected to the upper wing plate and the lower wing plate; the prefabricated steel cage is composed of several layers of steel mesh, and steel trusses are arranged between adjacent layers of steel mesh;

[0014] When adjacent prefabricated steel cages are connected, two C-shaped steels of the same size between adjacent ends are butted and fixed by fasteners passing through the webs of the C-shaped steels.

[0015] Preferably, when the end of the prefabricated steel cage is welded and fixed to the C-shaped steel, the uppermost single or double-layer steel mesh of the prefabricated steel cage is welded to the upper side or upper and lower sides of the upper wing plate of the C-shaped steel in an overlapping manner.

[0016] Preferably, when the end of the prefabricated steel cage is welded and fixed to the C-shaped steel, the bottom single or double layers of steel mesh of the prefabricated steel cage are welded to the lower side or upper and lower sides of the lower wing plate of the C-shaped steel in an overlapping manner.

[0017] Preferably, a plurality of rows of predetermined mounting holes are distributed on the web of the C-shaped steel, one row of which is on the horizontal center line of the web, and the remaining rows are symmetrically distributed on both sides of the horizontal center line, with the same row spacing.

[0018] Preferably, the C-shaped steel is used as a hoisting tool when hoisting the prefabricated steel cage to increase the overall rigidity of the prefabricated steel cage; after the prefabricated steel cage is connected, the C-shaped steel is cast in concrete together to serve as a load-bearing member of the structure.

[0019] In a second aspect, another steel-shaped connecting device with integrated reinforcement suitable for a nuclear island is provided, which is used to connect and fix two prefabricated reinforcement cages, including an H-shaped steel welded and fixed to the ends of the prefabricated reinforcement cage; the upper and lower sides of the web of the H-shaped steel are respectively connected to the upper wing plate and the lower wing plate; the prefabricated reinforcement cage is composed of several layers of reinforcement mesh, and a reinforcement truss is arranged between adjacent layers of reinforcement mesh;

[0020] When adjacent prefabricated steel cages are connected, two H-shaped steels of the same size between adjacent ends are butted together, and the wing plates of the H-shaped steels are welded.

[0021] Preferably, when the ends of the prefabricated steel cage are welded and fixed to the H-shaped steel, the uppermost single or double-layer steel mesh of the prefabricated steel cage is welded to the upper side or upper and lower sides of the upper wing plate of the H-shaped steel in an overlapping manner.

[0022] Preferably, when the end of the prefabricated steel cage is welded and fixed to the H-shaped steel, the bottom single or double layers of steel mesh of the prefabricated steel cage are welded to the lower side or upper and lower sides of the lower wing plate of the H-shaped steel in an overlapping manner.

[0023] Preferably, a plurality of casting holes are arranged on the web of the H-shaped steel.

[0024] In a third aspect, a construction method of a steel section connection device for a nuclear island integrated with steel bars as described in the above two aspects is provided, and the specific steps include:

[0025] S1. Prefabricated steel cages are made in advance at the processing site, and predetermined installation holes are processed on the web of C-shaped steel; or predetermined installation holes and casting holes are processed on the web of H-shaped steel;

[0026] S2. Welding and fixing the wing plate of the C-shaped steel or H-shaped steel to the steel mesh of the prefabricated steel cage by lap welding;

[0027] S3, aligning the C-shaped steel or H-shaped steel at the ends of two adjacent prefabricated reinforcement cages;

[0028] S4, connect two C-shaped steels or two H-shaped steels;

[0029] In S4, the C-shaped steel is connected by fasteners passing through the web; the H-shaped steel is connected by welding;

[0030] If the accuracy requirement is high, use H-beam welding connection; check the overall horizontality of the steel bar before welding;

[0031] If the accuracy requirement is lower, use C-shaped steel to fasten the connection; the overall levelness of the connected steel bars can be checked after installation. If the levelness deviation is too large, the fasteners can be removed for leveling again.

[0032] Compared with the prior art, the present invention has the following advantages and positive effects:

[0033] The present invention connects the C-shaped steel or H-shaped steel at the ends of two identical prefabricated steel cages by lap welding the upper and lower layers of steel mesh and C-shaped steel or H-shaped steel at the ends, thereby achieving rapid positioning and connection of the steel bars between adjacent steel cages, ensuring the strength of the connection nodes, and increasing the overall strength; and can solve the problem that the horizontal steel bars cannot be aligned, reduce the workload on site, and greatly improve the construction efficiency. In addition, the C-shaped steel or H-shaped steel can be flexibly applied to steel meshes of different structural forms, and the C-shaped steel or H-shaped steel at the ends of two identical prefabricated steel cages can be connected to achieve equal strength connection between the steel bars. According to different construction spaces and precision requirements, the fastening connection of the C-shaped steel and the welding connection of the H-shaped steel are reasonably selected to complete the steel cage connection; compared with the traditional on-site mechanical joint connection, the precision requirement is relatively low, and the construction workload is also smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 is a schematic diagram of a connection device in Embodiment 1 or Embodiment 3 of the present invention;

[0036] Figure 2 is a schematic diagram of a connection device in Embodiment 2 or Embodiment 3 of the present invention;

[0037] In the figure:

[0038] 1. Prefabricated steel cage; 2. C-shaped steel; 3. High-strength connecting bolts; 4. High-strength connecting nuts; 5. H-shaped steel. DETAILED DESCRIPTION

[0039] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0040] The present invention is described in detail below in conjunction with the accompanying drawings.

[0041] Example 1

[0042] This embodiment discloses a steel section connection device suitable for integrated steel bars of a nuclear island, such as Figure 1 As shown, it includes two prefabricated steel cages 1, which are made of multiple layers of steel mesh, and a steel truss is arranged between the upper steel mesh and the lower steel mesh. The steel truss is arranged to support the upper steel mesh to prevent the upper steel mesh from being deformed under the action of its own weight, and at the same time play a certain shear resistance role.

[0043] At the end of the prefabricated steel cage 1, a C-shaped steel 2 is welded. The C-shaped steel 2 includes a web, which connects the upper wing and the lower wing, and the two wing are perpendicular to the web. Figure 1 As shown, at one end of the prefabricated steel cage 1, the top steel mesh is welded and fixed to the upper angle plate of the C-shaped steel 2. It should be noted that all the steel bars on the steel mesh that are perpendicular to the upper angle plate are welded and fixed to the upper angle plate in an overlapping manner, and the overlapping length is equal to the width of the upper angle plate. The steel mesh is welded and fixed to the upper surface of the upper angle plate. Similarly, the bottom steel mesh of the prefabricated steel cage 1 is fixedly connected to the lower angle plate of the C-shaped steel 2, and the bottom steel mesh is located on the lower surface of the lower angle plate of the C-shaped steel 2. In this way, the C-shaped steel 2 is set in the prefabricated steel cage 1, and when adjacent C-shaped steels are connected, their strength can achieve equal strength connection between the steel bars, and the strength of the connection node is higher.

[0044] It can be understood that when there are many layers of steel mesh in the prefabricated steel cage 1, the top two layers of steel mesh can be welded and fixed to the upper corner plate of the C-shaped steel, and the top two layers of steel mesh sandwich the upper corner plate of the C-shaped steel in the middle; the bottom two layers of steel mesh can be welded and fixed to the lower corner plate of the C-shaped steel, and the bottom two layers of steel mesh sandwich the lower corner plate of the C-shaped steel in the middle, making the connection more stable and higher in strength.

[0045] like Figure 1 As shown, between two identical prefabricated steel cages, the webs of the C-shaped steel 2 at the ends of the two prefabricated steel cages are aligned up and down and left and right, so that the two prefabricated steel cages can be aligned, so that the horizontal ribs on the steel mesh between the two prefabricated steel cages can be at the same level and aligned; fasteners are passed through the webs of the two C-shaped steels 2 for fastening connection, thereby achieving the connection between the ends of the two prefabricated steel cages. This avoids the mechanical joint connection of the steel bars at the ends of the two steel cages one by one in the traditional construction process, which can reduce the workload and improve the efficiency. In this embodiment, the fasteners are selected from high-strength connecting bolts 3 and high-strength connecting nuts 4, and the connection of the fasteners is completed by tightening the high-strength connecting nuts 4 at both ends of the high-strength connecting bolts 3.

[0046] It should be noted that there are several rows of pre-set installation holes on the web of the C-shaped steel for passing fasteners; one row is on the horizontal center line of the web, and the other rows are symmetrically distributed on both sides of the horizontal center line with the same row spacing. The number of rows, row spacing and quantity of pre-set installation holes on the C-shaped steel at the end of the same prefabricated steel cage are consistent.

[0047] In this embodiment, the C-shaped steel at the end of the prefabricated steel cage 1 can be used as a lifting tool. When the prefabricated steel cage is lifted, the C-shaped steel at the end of the prefabricated steel cage 1 is used for lifting, which can reduce the damage to the steel mesh and increase the overall rigidity of the prefabricated steel cage. Moreover, after the adjacent prefabricated steel cages are connected, the C-shaped steel is cast in the concrete together and participates in the load-bearing as a load-bearing member of the structure.

[0048] It can be understood that in this embodiment, the connection between adjacent prefabricated steel cages can be completed by connecting the two C-shaped steels. Compared with the traditional mechanical joint connection, each horizontal reinforcement must be aligned and connected, which not only saves time and effort, but also can avoid the situation where when the mechanical joint connection is used, when the supporting steel bars are offset, the connected horizontal steel bars will be offset, and the construction workers will need to knock the horizontal steel bars with a hammer, causing the mechanical joint connection to deviate, which will also cause the steel mesh to deviate.

[0049] In this embodiment, the overall levelness of the connecting steel bars can be checked after installation. If the levelness deviation is too large, the high-strength connecting bolts can be removed for leveling again.

[0050] Example 2

[0051] This embodiment provides a steel connection device for integration of reinforcement bars in a nuclear island, which is different from the steel connection device for integration of reinforcement bars in a nuclear island disclosed in Example 1 in that the C-shaped steel 2 is replaced by the H-shaped steel 5. The way in which the prefabricated reinforcement cage 1 is connected to the H-shaped steel 5 is the same as the way in which the prefabricated reinforcement cage 1 is connected to the C-shaped steel 2.

[0052] Specifically, the prefabricated steel cage 1 is composed of several layers of steel mesh, and steel trusses are arranged between adjacent layers of steel mesh; the ends of the prefabricated steel cage 1 are welded and fixed to the H-shaped steel 5. When the ends of the prefabricated steel cage are welded and fixed to the H-shaped steel, when there are many layers of steel mesh, the top two layers of steel mesh of the prefabricated steel cage are welded to the upper and lower sides of the upper wing plate of the H-shaped steel in an overlapping manner; the bottom two layers of steel mesh of the prefabricated steel cage are welded to the upper and lower sides of the lower wing plate of the H-shaped steel in an overlapping manner.

[0053] When the number of steel mesh layers is small, the top steel mesh layer of the prefabricated steel cage is welded to the upper side of the upper wing plate of the H-shaped steel by overlapping; the bottom steel mesh layer of the prefabricated steel cage is welded to the lower side of the lower wing plate of the H-shaped steel by overlapping.

[0054] It should be noted that in this embodiment, when two identical prefabricated steel cages are connected, two H-shaped steels of the same size between adjacent ends are butted, that is, the upper wing plates of the two H-shaped steels are aligned with each other, and the lower wing plates are aligned with each other, and then welding is performed. Since a cavity will be formed between the two H-shaped steels after they are connected, and the H-shaped steels will be cast together as load-bearing components, in order to fill the cavity with concrete, a number of casting holes are set on the web of the H-shaped steel for concrete to flow into the cavity.

[0055] When two identical prefabricated steel cages are connected, the steel bars at the connection position are dense and it is impossible to insert the steel bars therein to tighten the bolts. In this case, the H-shaped steels at the connection position can be directly welded by using the present embodiment.

[0056] The difference is that, when this embodiment is used, it is necessary to check the horizontality of the steel bars connecting the whole before welding the H-shaped steel of the prefabricated steel cage, and then weld.

[0057] Example 3

[0058] This embodiment provides a construction method for a steel section connection device for a nuclear island with integrated reinforcement, using a steel section connection device for a nuclear island with integrated reinforcement disclosed in Embodiment 1 or Embodiment 2, and the specific steps are as follows:

[0059] S1. Prefabricated steel cages are made in advance at the processing site, and predetermined installation holes are processed on the web of C-shaped steel; or casting holes are processed on the web of H-shaped steel;

[0060] S2. Welding and fixing the wing plate of the C-shaped steel or H-shaped steel to the steel mesh of the prefabricated steel cage by lap welding;

[0061] S3, aligning the C-shaped steel or H-shaped steel at the ends of two adjacent prefabricated reinforcement cages;

[0062] S4, connect two C-shaped steels or two H-shaped steels;

[0063] In S4, the C-shaped steel is connected by a web passing through a fastener. In this embodiment, the fasteners are high-strength connecting bolts and high-strength connecting nuts; the H-shaped steel is connected by welding;

[0064] If the accuracy requirement is high, use H-beam welding connection; check the overall horizontality of the steel bar before welding;

[0065] If the accuracy requirement is lower, use C-shaped steel to fasten the connection; the overall levelness of the connected steel bars can be checked after installation. If the levelness deviation is too large, the fasteners can be removed for leveling again.

[0066] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A steel-shaped connection device for a nuclear island with integrated steel bars, used to connect and fix two prefabricated steel cages, characterized in that: It includes a C-shaped steel welded and fixed to the end of the prefabricated steel cage; the upper and lower sides of the web of the C-shaped steel are respectively connected to the upper wing plate and the lower wing plate; the prefabricated steel cage is composed of several layers of steel mesh, and steel trusses are arranged between adjacent layers of steel mesh; When adjacent prefabricated steel cages are connected, two C-shaped steels of the same size between adjacent ends are butted and fixed by fasteners passing through the webs of the C-shaped steels.

2. A steel section connection device for integrated reinforcement of a nuclear island as claimed in claim 1, characterized in that: When the end of the prefabricated steel cage is welded and fixed to the C-shaped steel, the uppermost single or double-layer steel mesh of the prefabricated steel cage is welded to the upper side or upper and lower sides of the upper wing plate of the C-shaped steel in an overlapping manner.

3. A steel section connection device for integrated reinforcement applicable to a nuclear island as claimed in claim 1, characterized in that: When the end of the prefabricated steel cage is welded and fixed to the C-shaped steel, the bottom single or double layers of steel mesh of the prefabricated steel cage are welded to the lower side or upper and lower sides of the lower wing plate of the C-shaped steel in an overlapping manner.

4. A steel section connection device for integrated reinforcement of a nuclear island as claimed in claim 1, characterized in that: The web of the C-shaped steel is provided with a plurality of rows of predetermined mounting holes, one of which is on the horizontal center line of the web, and the remaining rows are symmetrically distributed on both sides of the horizontal center line, with the same row spacing.

5. The steel-shaped steel connection device for nuclear island integration according to claim 1, characterized in that: The C-shaped steel is used as a hoisting tool when hoisting the prefabricated steel cage to increase the overall rigidity of the prefabricated steel cage; after the prefabricated steel cage is connected, the C-shaped steel is poured into the concrete together to serve as a load-bearing member of the structure.

6. A steel-shaped connection device for a nuclear island with integrated steel bars, used to connect and fix two prefabricated steel cages, characterized in that: It includes an H-shaped steel welded and fixed to the end of the prefabricated steel cage; the upper and lower sides of the web of the H-shaped steel are respectively connected to the upper wing plate and the lower wing plate; the prefabricated steel cage is composed of several layers of steel mesh, and steel trusses are arranged between adjacent layers of steel mesh; When adjacent prefabricated steel cages are connected, two H-shaped steels of the same size between adjacent ends are butted together, and the wing plates of the H-shaped steels are welded.

7. A steel section connection device for integrated reinforcement applicable to a nuclear island as claimed in claim 6, characterized in that: When the end of the prefabricated steel cage is welded and fixed to the H-shaped steel, the uppermost single or double-layer steel mesh of the prefabricated steel cage is welded to the upper side or upper and lower sides of the upper wing plate of the H-shaped steel in an overlapping manner.

8. The steel bar integrated steel connection device suitable for a nuclear island as claimed in claim 6, characterized in that: When the end of the prefabricated steel cage is welded and fixed to the H-shaped steel, the bottom single or double layers of steel mesh of the prefabricated steel cage are welded to the lower side or upper and lower sides of the lower wing plate of the H-shaped steel in an overlapping manner.

9. The steel bar integrated steel connection device suitable for a nuclear island as claimed in claim 6, characterized in that: A plurality of casting holes are arranged on the web of the H-shaped steel.

10. A construction method for a steel section connection device integrated with steel bars applicable to a nuclear island as claimed in any one of claims 1 to 9, characterized in that: The specific steps include: S1. Prefabricated steel cages are made in advance at the processing site, and predetermined installation holes are processed on the web of C-shaped steel; or predetermined installation holes and casting holes are processed on the web of H-shaped steel; S2. Welding and fixing the wing plate of the C-shaped steel or H-shaped steel to the steel mesh of the prefabricated steel cage by lap welding; S3, aligning the C-shaped steel or H-shaped steel at the ends of two adjacent prefabricated reinforcement cages; S4, connect two C-shaped steels or two H-shaped steels; In S4, the C-shaped steel is connected by fasteners passing through the web; the H-shaped steel is connected by welding; If the accuracy requirement is high, use H-beam welding connection; check the overall horizontality of the steel bar before welding; If the accuracy requirement is lower, use C-shaped steel to fasten the connection; the overall levelness of the connected steel bars can be checked after installation. If the levelness deviation is too large, the fasteners can be removed for leveling again.

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