Integrated nuclear power plant steel plate concrete composite floor and construction method

Abstract

The invention provides an integrated nuclear power plant steel plate concrete composite floor and a construction method, the composite floor comprises a bottom steel plate and a reinforcing mesh, the bottom steel plate is fixedly provided with at least two first support plates at intervals along the length and / or width direction, and one end of each first support plate deviating from the bottom steel plate forms a first support surface; at least two second supporting plates are fixedly arranged on the bottom steel plate or the first supporting plates, second supporting faces are formed at the ends, away from the bottom steel plate, of the second supporting plates, and the vertical distance between the second supporting faces and the bottom steel plate is larger than that between the first supporting faces and the bottom steel plate; the reinforcing mesh comprises a first reinforcing mesh and a second reinforcing mesh, the first reinforcing mesh is laid and positioned on the first supporting surface, and the second reinforcing mesh is laid and positioned on the second supporting surface; the composite floor further comprises a concrete layer poured on the outer sides of the bottom steel plate and the reinforcing mesh, and the concrete layer completely covers the reinforcing mesh.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to an integrated nuclear power plant steel-concrete composite floor slab and its construction method. Background Technology

[0002] Currently, the construction of nuclear island concrete structures in my country's nuclear power plants still mainly relies on traditional cast-in-place processes, which have problems such as complicated procedures, long construction cycles, and high risks associated with high-altitude operations. However, the dual pressures of rising labor costs and increasing requirements for the economic viability of nuclear power have driven prefabricated nuclear island concrete structures to become the core path for the industry's transformation and upgrading.

[0003] Among them, the steel-concrete composite (SC) system, as an important component of third-generation nuclear power technology, has been applied on a large scale. However, the traditional SC floor slab structure module generally adopts a phased operation mode of first hoisting the steel structure floor slab and then binding the reinforcing bars on site. This not only suffers from large positioning errors of the main reinforcement due to the limited space on site, resulting in a high rework rate, but also has the problem that items such as embedded pipes and electrical conduits cannot be pre-installed at the same time. Later drilling is prone to breaking the reinforcing bars, requiring additional reinforcement. As a result, the construction cost of a single unit increases by tens of millions of yuan.

[0004] Based on this, the inventors of this application propose an integrated nuclear power plant steel-concrete composite floor slab and construction method to solve one or more of the above-mentioned technical problems. Summary of the Invention

[0005] The present invention solves the above-mentioned technical problems through the following technical solution: This invention provides an integrated steel-concrete composite floor slab for nuclear power plants, comprising: A bottom steel plate, with at least two first support plates fixed at intervals along its length and / or width, the first support plates forming a first support surface at one end away from the bottom steel plate; at least two second support plates are fixed on the bottom steel plate or the first support plates, the second support plates forming a second support surface at one end away from the bottom steel plate, the vertical distance between the second support surface and the bottom steel plate is greater than the vertical distance between the first support surface and the bottom steel plate; The steel mesh includes a first steel mesh and a second steel mesh, wherein the first steel mesh is laid and positioned on the first support surface, and the second steel mesh is laid and positioned on the second support surface; The composite floor slab also includes a concrete layer poured outside the bottom steel plate and the steel mesh, the concrete layer completely covering the steel mesh.

[0006] According to one embodiment of the present invention, the first support plate is a T-shaped steel, and one end of the T-shaped steel is welded and fixed to the bottom steel plate.

[0007] According to one embodiment of the present invention, at least two of the first support plates are spaced apart along the width direction of the bottom steel plate; The bottom steel plate is also provided with at least two stiffening plates at intervals along its length, and the stiffening plates are welded and fixed to the bottom steel plate and the first support plate.

[0008] According to one embodiment of the present invention, the stiffening plate is arranged perpendicularly to the first support plate and the bottom steel plate.

[0009] According to one embodiment of the present invention, one end of the second support plate is welded and fixed to the top of the first support plate; the end of the second support plate opposite to the bottom steel plate is also provided with a lifting ring.

[0010] According to one embodiment of the present invention, the number of the second support plates is four, and they are respectively disposed in the four corner areas of the bottom steel plate.

[0011] According to one embodiment of the present invention, at least two third support plates are further provided in the middle of the bottom steel plate, and the end of the third support plate opposite to the bottom steel plate forms a third support surface, and the third support surface is at the same height as the second support surface.

[0012] According to one embodiment of the present invention, the cross-sectional dimension of the third support plate increases in the direction away from the bottom steel plate; The third support plate is arranged parallel to the first support plate.

[0013] According to one embodiment of the present invention, the first support plate, the second support plate and the third support plate are all steel plates.

[0014] This invention also provides a construction method for an integrated nuclear power plant steel-concrete composite floor slab, using the integrated nuclear power plant steel-concrete composite floor slab as described above, the construction method comprising: Step 1: At least two first support plates are fixed to the bottom steel plate at the prefabrication plant; Step 2: Prefabricate at least two second support plates and transport them to the site simultaneously with the assembly consisting of the bottom steel plate and the first support plate; Step 3: Tie the first and second steel mesh in the on-site processing area; Step 4: Lay the first steel mesh on the first support surface at the top of the first support plate, then weld the second support plate to the bottom steel plate or the first support plate, and lay the second steel mesh on the second support surface of the second support plate. Step 5: Pour a concrete layer integrally onto the outside of the bottom steel plate, the first support plate, the second support plate, the first steel mesh, and the second steel mesh.

[0015] The positive and progressive effects of this invention are as follows: This invention relates to an integrated steel-concrete composite floor slab for nuclear power plants. By fixing a first support plate at intervals on the bottom steel plate to form a first support surface, and fixing a second support plate on the bottom steel plate or the first support plate to form a second support surface with a higher height, the first and second steel meshes can be accurately laid and positioned on the support surfaces at their respective heights. This achieves a stable layered arrangement of the two layers of steel meshes, effectively ensuring the positioning accuracy of the main reinforcement and reducing rework rates. Furthermore, the fixed connection between the first and second support plates and the bottom steel plate enhances the overall rigidity of the composite floor slab and the structural stability during hoisting. Combined with a concrete layer that completely covers the steel mesh, this further strengthens the synergistic stress effect at the steel-concrete interface. At the same time, it simplifies the construction process and avoids the drawbacks of traditional processes, such as secondary binding of steel bars and difficulty in simultaneous pre-installation of embedded materials. This significantly improves the construction efficiency, construction safety, and quality control of nuclear power plant floor slabs. Attached Figure Description

[0016] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the integrated nuclear power plant steel-concrete composite floor slab under hoisting conditions according to the present invention; Figure 2 This is a structural schematic diagram of a location of the integrated nuclear power plant steel-concrete composite floor slab of the present invention; Figure 3 This is a cross-sectional view of another location of the integrated nuclear power plant steel-concrete composite floor slab of the present invention; Figure 4 This is a flowchart of the construction method for the integrated steel-concrete composite floor slab of a nuclear power plant according to the present invention.

[0017] 1. Base steel plate; 11. First support plate; 111. First support surface; 12. Second support plate; 121. Second support surface; 122. Lifting ring; 13. Stiffening plate; 14. Third support plate; 141. Third support surface; 2. Reinforcing mesh; 21. First reinforcing mesh; 22. Second reinforcing mesh; 3. Concrete layer. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] Traditional cast-in-place construction methods for nuclear island concrete structures in nuclear power plants have several drawbacks: complex procedures, long cycles, high risks associated with working at heights, and problems with traditional steel-concrete composite (SC) floor slabs, such as large errors in main reinforcement positioning, high rework rates, inability to simultaneously pre-install embedded parts, and high construction costs.

[0021] Based on this, this application proposes an integrated steel-concrete composite floor slab for nuclear power plants, comprising a bottom steel plate 1 and a reinforcing mesh 2. At least two first support plates 11 are fixed at intervals along the length and / or width of the bottom steel plate 1, with the first support plates 11 forming a first support surface 111 at one end away from the bottom steel plate 1. At least two second support plates 12 are fixed on the bottom steel plate 1 or the first support plates 11, with the second support plates 12 forming a second support surface 121 at one end away from the bottom steel plate 1. The vertical distance between the second support surface 121 and the bottom steel plate 1 is greater than the vertical distance between the first support surface 111 and the bottom steel plate 1. The reinforcing mesh 2 includes a first reinforcing mesh 21 and a second reinforcing mesh 22. The first reinforcing mesh 21 is laid and positioned on the first support surface 111, and the second reinforcing mesh 22 is laid and positioned on the second support surface 121. The composite floor slab also includes a concrete layer 3 poured outside the bottom steel plate 1 and the reinforcing mesh 2, with the concrete layer 3 completely covering the reinforcing mesh 2.

[0022] like Figure 1 As shown, the bottom steel plate 1 is a square plate, and four first support plates 11 are spaced apart along its width direction. The length of the first support plates 11 is the same as the length of the bottom steel plate 1.

[0023] In some other embodiments, the number of first support plates 11 may also be two, three, or five, etc. Figure 1 The illustration uses four first support plates 11 as an example, but the specific number of first support plates 11 is not limited.

[0024] Optionally, at least two first support plates 11 may be provided along the length of the bottom steel plate 1; or at least two first support plates 11 may be provided along both the length and width of the bottom steel plate 1 to form a cross-shaped arrangement. The number and arrangement of the first support plates 11 can be selected according to actual needs and are not limited here.

[0025] For the first support plate 11, it is preferably a T-shaped steel plate, with one end of the T-shaped steel plate welded and fixed to the bottom steel plate 1. T-shaped steel is chosen because it has excellent bending stiffness and load-bearing capacity. As the first support plate 11, it can provide a stable support platform for the first steel mesh 21. At the same time, the welding and fixing method between it and the bottom steel plate 1 ensures the connection strength and avoids loosening or deformation during construction and use, further improving the structural stability and load-bearing reliability of the composite floor slab, and meeting the high-strength requirements of nuclear power plant floor slabs.

[0026] In one embodiment, at least two stiffening plates 13 are also provided at intervals along the length of the bottom steel plate 1, and the stiffening plates 13 are welded and fixed to the bottom steel plate 1 and the first support plate 11.

[0027] In this embodiment, the first support plates 11 are spaced apart along the width direction of the bottom steel plate 1. Since there are at least two first support plates 11, stiffening plates 13 can be provided at both ends near the width direction of the bottom steel plate 1. That is, the stiffening plates 13 are welded and fixed to the relatively outer first support plates 11. Alternatively, the stiffening plates 13 can also extend along the width direction of the bottom steel plate 1 and be welded and fixed to each of the first support plates 11, thereby forming a cross-shaped vertical arrangement of the stiffening plates 13 and the first support plates 11.

[0028] That is, by arranging the first support plate 11 at intervals along the width direction of the bottom steel plate 1 and welding and fixing the stiffening plate 13 along the length direction of the bottom steel plate 1, the first support plate 11 and the stiffening plate 13 form a crisscross support system, which can significantly improve the bending and torsional resistance of the bottom steel plate 1 and effectively suppress the deformation problem of the floor slab during prefabrication, transportation and hoisting. At the same time, the synergistic effect of the stiffening plate 13 with the first support plate 11 and the bottom steel plate 1 further optimizes the structural stress transmission path, thereby avoiding local stress concentration and ensuring the overall structural safety of the composite floor slab.

[0029] The bottom end of the second support plate 12 can be welded and fixed to the bottom steel plate 1, or it can be welded and fixed to the first support plate 11. Both methods are acceptable and are not limited here. The height difference between the second support surface 121 and the first support surface 111 can be determined according to the set spacing between the first steel mesh 21 and the second steel mesh 22.

[0030] like Figure 1 and Figure 2 As shown, one end of the second support plate 12 is welded and fixed to the top of the first support plate 11; the second support plate 12 is also provided with a lifting ring 122 at the end away from the bottom steel plate 1.

[0031] The number of second support plates 12 is preferably four, and they are respectively located in the four corner areas of the bottom steel plate 1.

[0032] By welding the second support plate 12 to the top of the first support plate 11, a strong connection is ensured, space is utilized efficiently, and interference with the first steel mesh 21 is avoided. The addition of lifting rings 122 at the top of the second support plate 12 eliminates the need for additional lifting equipment, overcoming the limitations of existing technologies for open-top construction in nuclear power plants. This simplifies the lifting process, improves construction convenience and safety, and reduces the risk of structural damage during lifting. The four lifting rings 122 also ensure stability during the lifting process.

[0033] like Figure 1 and Figure 2 As shown, at least two third support plates 14 are provided in the middle of the bottom steel plate 1. The end of the third support plate 14 away from the bottom steel plate 1 forms a third support surface 141. The third support surface 141 is at the same height as the second support surface 121.

[0034] By adding a third support plate 14 at the same height as the second support surface 121 in the middle of the bottom steel plate 1, effective support can be provided for the middle area of ​​the second steel mesh 22, avoiding sagging or deformation caused by the large span of the second steel mesh 22, ensuring the overall positioning accuracy and laying flatness of the second steel mesh 22. At the same time, the third support plate 14 works in synergy with the second support plate 12, which can make the stress on the second steel mesh 22 more balanced.

[0035] Furthermore, the cross-sectional dimensions of the third support plate 14 increase in the direction away from the bottom steel plate 1; the third support plate 14 is arranged parallel to the first support plate 11.

[0036] The cross-sectional dimensions of the third support plate 14 increase in the direction away from the bottom steel plate 1, which can significantly improve its top support strength and shear resistance, thereby better bearing the load of the second steel mesh 22 and avoiding local stress concentration.

[0037] Setting the third support plate 14 parallel to the first support plate 11 ensures the consistency of the support direction, optimizes the force transmission path of the structure, makes the overall structure more reasonably stressed, and meets the requirements of long-term stable operation of nuclear power plant floor slabs.

[0038] For the concrete layer 3, which completely covers the bottom steel plate 1 and the steel mesh 2, the features of the second support plate 12 and the third support plate 14 protruding outside the steel mesh 2 can be cut.

[0039] This application also proposes a construction method for an integrated steel-concrete composite floor slab in a nuclear power plant, employing the aforementioned integrated steel-concrete composite floor slab for nuclear power plants. The construction method includes: S1. At least two first support plates are fixed on the bottom steel plate at the prefabrication plant.

[0040] Specifically, at the prefabrication plant, full penetration butt welding is used between the bottom steel plate and the first support plate to improve the connection stability between the bottom steel plate and the first support plate.

[0041] S2. Prefabricate at least two second support plates and transport them to the site simultaneously with the components consisting of the bottom steel plate and the first support plate.

[0042] At this time, the second support plate is not welded to the first support plate or the bottom steel plate.

[0043] S3. Tie the first and second steel mesh in the on-site processing area.

[0044] S4. Lay the first steel mesh on the first support surface at the top of the first support plate, then weld the second support plate to the bottom steel plate or the first support plate, and lay the second steel mesh on the second support surface of the second support plate.

[0045] First, the first steel mesh is laid on the first support plate. Then, the second support plate is welded to the bottom steel plate or the first support plate, and the third support plate is welded to the bottom steel plate. After welding, the second steel mesh is laid on the second support plate. During this step, embedded pipes, electrical conduits, embedded parts, and other items are pre-installed simultaneously.

[0046] S5. Concrete layer is poured integrally on the outside of the bottom steel plate, the first support plate, the second support plate, the first steel mesh, and the second steel mesh.

[0047] After the bottom steel plate, the first support plate, the second support plate, the first steel mesh, and the second steel mesh are hoisted into place, the three-dimensional position of the first steel mesh and the second steel mesh can be adjusted to ensure that the main reinforcement of the mesh is precisely aligned with the pre-reserved sleeve in the wall.

[0048] The first support plate, the second support plate, the stiffening plate, and the third support plate remain in the concrete layer as shear keys, while the parts of the structure where the second and third support plates are exposed in the concrete layer can be cut.

[0049] The construction method proposed in this application adopts a combination of prefabrication and on-site assembly, which significantly reduces on-site high-altitude operations and secondary binding procedures, solving the problems of long construction cycles and high risks associated with high-altitude operations in traditional processes. Moreover, the first and second support plates, together with the laying of the steel mesh, enable rapid and accurate positioning of the steel mesh, significantly improving construction efficiency and reducing construction costs. Furthermore, the method of integrally pouring concrete layers ensures the structural integrity.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0052] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. An integrated steel-concrete composite floor slab for nuclear power plants, characterized in that, include: A bottom steel plate, with at least two first support plates fixed at intervals along its length and / or width, the first support plates forming a first support surface at one end away from the bottom steel plate; at least two second support plates are fixed on the bottom steel plate or the first support plates, the second support plates forming a second support surface at one end away from the bottom steel plate, the vertical distance between the second support surface and the bottom steel plate is greater than the vertical distance between the first support surface and the bottom steel plate; The steel mesh includes a first steel mesh and a second steel mesh, wherein the first steel mesh is laid and positioned on the first support surface, and the second steel mesh is laid and positioned on the second support surface; The composite floor slab also includes a concrete layer poured outside the bottom steel plate and the steel mesh, the concrete layer completely covering the steel mesh.

2. The integrated nuclear power plant steel-concrete composite floor slab according to claim 1, characterized in that, The first support plate is a T-shaped steel, and one end of the T-shaped steel is welded and fixed to the bottom steel plate.

3. The integrated nuclear power plant steel-concrete composite floor slab according to claim 1, characterized in that, At least two of the first support plates are spaced apart along the width direction of the bottom steel plate; The bottom steel plate is also provided with at least two stiffening plates at intervals along its length, and the stiffening plates are welded and fixed to the bottom steel plate and the first support plate.

4. The integrated nuclear power plant steel-concrete composite floor slab according to claim 3, characterized in that, The stiffening plate is perpendicular to the first support plate and the bottom steel plate.

5. The integrated nuclear power plant steel-concrete composite floor slab according to claim 1, characterized in that, One end of the second support plate is welded and fixed to the top of the first support plate; the end of the second support plate opposite to the bottom steel plate is also provided with a lifting ring.

6. The integrated nuclear power plant steel-concrete composite floor slab according to claim 5, characterized in that, There are four second support plates, which are located at the four corners of the bottom steel plate.

7. The integrated nuclear power plant steel-concrete composite floor slab according to claim 1, characterized in that, At least two third support plates are provided in the middle of the bottom steel plate. The end of the third support plate opposite to the bottom steel plate forms a third support surface, and the third support surface is at the same height as the second support surface.

8. The integrated nuclear power plant steel-concrete composite floor slab according to claim 7, characterized in that, The cross-sectional dimensions of the third support plate increase in the direction away from the bottom steel plate; The third support plate is arranged parallel to the first support plate.

9. The integrated nuclear power plant steel-concrete composite floor slab according to claim 7, characterized in that, The first support plate, the second support plate, and the third support plate are all steel plates.

10. A construction method for an integrated steel-concrete composite floor slab in a nuclear power plant, characterized in that, The construction method for using the integrated nuclear power plant steel-concrete composite floor slab as described in any one of claims 1-9 includes: Step 1: At least two first support plates are fixed to the bottom steel plate at the prefabrication plant; Step 2: Prefabricate at least two second support plates and transport them to the site simultaneously with the assembly consisting of the bottom steel plate and the first support plate; Step 3: Tie the first and second steel mesh in the on-site processing area; Step 4: Lay the first steel mesh on the first support surface at the top of the first support plate, then weld the second support plate to the bottom steel plate or the first support plate, and lay the second steel mesh on the second support surface of the second support plate. Step 5: Pour a concrete layer integrally onto the outside of the bottom steel plate, the first support plate, the second support plate, the first steel mesh, and the second steel mesh.

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