Fabricated formwork-free floor suitable for nuclear power plant and construction method

Abstract

The invention relates to the technical field of nuclear power plant building construction, in particular to a fabricated formwork-free floor suitable for a nuclear power plant and a construction method. The formwork-free floor slab comprises a bottom formwork plate, a supporting layer and a steel bar layer. The edge of the bottom diaphragm plate is lapped on the bracket and is fixedly connected with the bracket; the supporting layer is arranged on the bottom diaphragm plate and comprises a connecting part located on the lower side and a supporting part located on the upper side, and the connecting part is fixedly connected with the bottom diaphragm plate; the reinforcing steel bar layer is located on the upper side of the supporting layer and comprises first reinforcing steel bars and second reinforcing steel bars, the first reinforcing steel bars are connected with the supporting parts of the supporting ribs, and the second reinforcing steel bars are located on the upper sides of the second reinforcing steel bars and are perpendicular to the first reinforcing steel bars. In the invention, the bottom diaphragm plate is used as a lower stress component and also used as a template, so that the floor does not need to be additionally supported when being mounted, the construction process is simplified, the construction efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant building construction, and in particular to an assembled formwork-free floor slab suitable for a nuclear power plant and a construction method thereof. Background Art

[0002] As an industrial facility with high safety requirements, the design and construction of the building structure of a nuclear power plant must meet strict safety standards. As an important part of the nuclear power plant building, the floor slab has various forms, including cast-in-place concrete slabs, prefabricated slabs, corrugated steel plates, "CA modular slabs", steel truss slabs, etc. These slab forms have their own characteristics, but there are certain limitations in practical applications.

[0003] Cast-in-place slabs require scaffolding, which is not conducive to the early introduction of equipment. In addition, the diameter of the steel bars used in nuclear power plants is generally large, and the manual on-site steel bar tying is extremely inefficient and takes a long time. The prefabricated layer of the prefabricated slab is often used only as a template. While increasing the thickness of the slab, it also increases the amount of reinforcement, which is not economical. Corrugated steel plates are often used in areas with thinner slabs, but corrugated steel plates need to be used together with steel beams, which limits the net height of the room. The bottom plate of the "CA floor module" is a steel plate, and steel sections (I-beams or T-beams) are welded on the steel plate. The amount of steel used is large and the economy is not high. In addition, large pipelines are sometimes required to be arranged in the floor slabs of nuclear power plants, and the arrangement of steel sections is extremely difficult for the installation of pipelines. The overlap length of the steel truss floor at the wet joint is long, and the prefabrication efficiency is average. In addition, the above-mentioned floor forms all require on-site tying of the upper and lower layers of steel bars during construction, and integrated hoisting cannot be achieved.

[0004] Therefore, the design and construction of nuclear power plant floors has always been a technical challenge in the field of industrial construction. The main problems existing in the existing technology include: low construction efficiency: cast-in-place slabs require scaffolding, long construction period, and low efficiency of manual steel bar tying. Economic issues: prefabricated slabs increase the thickness and reinforcement amount, which is not very economical. Space limitations: corrugated steel plates need to be used in conjunction with steel beams, which limits the net height of the room. Difficulty in pipeline layout: When arranging large pipelines in the floor slab, the presence of steel sections makes installation complicated. Integrated lifting problem: the existing floor slab form cannot achieve integrated lifting, which increases the difficulty and cost of construction. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of an embodiment of the present invention is to provide an assembled formwork-free floor slab suitable for a nuclear power plant.

[0006] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A prefabricated formwork-free floor slab suitable for a nuclear power plant, which is used to be installed on a corbel on the side of a shear wall. The formwork-free floor slab comprises a bottom membrane plate, a supporting layer and a steel bar layer; the edge of the bottom membrane plate is overlapped on the corbel and fixedly connected to the corbel; the supporting layer is arranged on the bottom membrane plate, and comprises a connecting portion located on the lower side and a supporting portion on the upper side, and the connecting portion is fixedly connected to the bottom membrane plate; the steel bar layer is located on the upper side of the supporting layer, and comprises a first steel bar and a second steel bar, the first steel bar is connected to the supporting portion of the supporting bar, and the second steel bar is located on the upper side of the second steel bar and is arranged perpendicular to the first steel bar.

[0008] Optionally, the support layer is a 2S-type support rib, the support rib is double-curved along the transverse direction, and the bending spacing of the support rib is equal to the arrangement spacing of the first steel bars.

[0009] Optionally, the bottom membrane plate is a bottom membrane steel plate, and the bottom of the supporting rib is spot-welded to the bottom membrane steel plate.

[0010] Optionally, the supporting layer is a plurality of parallel arranged inclined steel plates, the inclined steel plates are at a predetermined angle to the bottom membrane plate, the bottom of the inclined steel plates is fixedly connected to the bottom membrane plate, and the top of the inclined steel plates is connected to the first steel bar.

[0011] Optionally, the bottom membrane plate is a bottom membrane steel plate, the bottom of the inclined steel plate is connected to the bottom membrane steel plate by spacing welding, and the inclined steel plate is also provided with openings for pouring concrete, and the openings are arranged along the horizontal direction.

[0012] Optionally, the corbel is a steel corbel, the bottom membrane plate is a bottom membrane steel plate, the bottom membrane steel plate is bolted or welded to the steel corbel, the shear wall is a double steel plate shear wall, lap steel bars are arranged on the supporting layer, and one end of the lap steel bars is embedded in the inner side of the double steel plate shear wall.

[0013] Optionally, shear nails are provided on the bottom membrane plate.

[0014] Optionally, the bottom membrane plate is provided with a lifting ear, and there are a plurality of the lifting ears, the plurality of lifting ears are arranged at a central portion of the bottom membrane plate, and the plurality of lifting ears are arranged in a matrix form.

[0015] Optionally, the formwork-free floor slab is composed of multiple blocks, the bottom membrane plates of the multiple blocks are connected by full-penetration welding, and the steel bar layers of the multiple blocks are overlapped by steel bars.

[0016] The embodiment of the present invention further provides a construction method of the assembled formwork-free floor slab applicable to a nuclear power plant as described above, comprising:

[0017] During the prefabrication stage, shear nails and lifting ears are set on the bottom membrane steel plate; support ribs or inclined steel plates are installed. When support ribs are used, the support ribs are bent according to the spacing of the first upper steel bars, and the lower part is spot welded to the bottom membrane steel plate; when inclined steel plates are used, the lower part of the inclined steel plate is welded to the bottom membrane steel plate by spacing; the first steel bar is installed with the support layer as support, and the second steel bar is installed with the first steel bar as support;

[0018] Hoist the formwork-free floor slab and place it on the steel brackets and connect them, and install the lap reinforcement extending into the double steel plate shear wall;

[0019] Pour concrete to complete the production of prefabricated formwork-free floor slabs.

[0020] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0021] The formwork-free floor slab can weld the support layer (S-shaped support ribs or inclined steel plates) to the bottom membrane plate during the prefabrication stage, and then tie the first upper steel bar (S-shaped support ribs or inclined steel plates as support), and then tie the second steel bar in the other direction (the first layer of steel bars as support). After completion, it can be hoisted in an integrated manner, and there is no need to tie the floor slab steel bars on site to achieve integrated hoisting. The bottom membrane plate serves as the lower load-bearing component and also as a formwork, so that the floor slab does not require additional formwork during installation, which simplifies the construction process, improves construction efficiency, and reduces costs. The setting of the support layer provides a stable platform for the subsequent installation of the steel bar layer, ensuring the integrity and load-bearing capacity of the floor slab. The vertical arrangement of the steel bar layer enhances the structural stability of the floor slab. At the same time, it is convenient for pipeline layout and the introduction of large equipment, meeting the high safety and practicality requirements of nuclear power plants for floor slabs.

[0022] Advantages of additional aspects of the present invention will be given in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, the spacing or size between each other is exaggerated to show the position of each part, and the schematic diagram is only used for illustration.

[0024] Figure 1 It is a schematic elevation diagram of an assembled formwork-free floor slab (S-shaped steel bars) provided in an embodiment of the present invention;

[0025] Figure 2It is a schematic elevation diagram of an assembled formwork-free floor slab (thin steel plate) provided in an embodiment of the present invention;

[0026] Figure 3 It is a schematic plan view of an assembled formwork-free floor provided in an embodiment of the present invention;

[0027] In the figure: 1. bottom membrane steel plate; 2. supporting layer; 3. first steel bar; 4. second steel bar; 5. concrete; 6. steel corbel; 7. double steel plate shear wall; 8. lap steel bar; 9. lifting lug; DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Example 1

[0030] In order to solve the technical problems mentioned in the background technology, this embodiment proposes an assembled formwork-free floor slab suitable for nuclear power plants, which is suitable for use in rooms between double steel plate shear walls of nuclear power plants.

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, the formwork-free floor slab is installed on the corbel on the side of the shear wall, including a bottom membrane plate, a supporting layer 2 and a steel bar layer; the edge of the bottom membrane plate is overlapped on the corbel and fixedly connected to the corbel; the supporting layer 2 is arranged on the bottom membrane plate, including a connecting portion located on the lower side and a supporting portion on the upper side, and the connecting portion is fixedly connected to the bottom membrane plate; the steel bar layer is located on the upper side of the supporting layer 2, including a first steel bar 3 and a second steel bar 4, the first steel bar 3 is connected to the supporting portion of the supporting bar, and the second steel bar 4 is located on the upper side of the second steel bar 4 and is arranged perpendicular to the first steel bar 3.

[0032] The formwork-free floor slab can weld the support layer 2 (S-shaped support ribs or inclined steel plates) to the bottom membrane plate during the prefabrication stage, and then tie the upper first steel bar 3 (S-shaped support ribs or inclined steel plates as support), and then tie the second steel bar 4 in the other direction (the first layer of steel bars as support) after completion. After completion, integrated lifting can be achieved, and there is no need to tie the floor slab steel bars on site to achieve integrated lifting. The bottom membrane plate serves as the lower load-bearing component and the formwork at the same time, so that the floor slab does not require additional formwork during installation, which simplifies the construction process, improves construction efficiency, and reduces costs. The setting of the support layer 2 provides a stable platform for the installation of the subsequent steel bar layer, ensuring the integrity and load-bearing capacity of the floor slab. The vertical arrangement of the steel bar layer enhances the structural stability of the floor slab. At the same time, it is convenient for pipeline layout and the introduction of large equipment, meeting the high safety and practicality requirements of nuclear power plants for floor slabs.

[0033] The support layer 2 is a 2S-shaped support bar, which is double-bent in the transverse direction, and the bending spacing of the support bar is equal to the arrangement spacing of the first steel bar 3. This design enables the support bar to better adapt to the force requirements of the floor slab, and its double-bent structure provides good mechanical properties. The bending spacing of the S-shaped support bar is equal to the arrangement spacing of the first steel bar 3, which can ensure the uniform distribution of the steel bar layer and improve the overall stability and bearing capacity of the floor slab.

[0034] The bottom membrane plate is a bottom membrane steel plate 1, and the bottom of the support rib is spot-welded to the bottom membrane steel plate 1. Spot welding is a simple and effective connection method, which can ensure a firm connection between the support rib and the bottom membrane steel plate 1. At the same time, spot welding has a fast construction speed and low cost, and is suitable for large-scale industrial production.

[0035] like Figure 2 As shown, the support layer 2 is a plurality of inclined steel plates (thin steel plates) arranged in parallel. Figure 2 Two inclined steel plates with different inclination angles are shown in the figure. In actual state, there is only one inclined steel plate with an inclination angle, the inclined steel plate and the bottom membrane plate are at a predetermined angle, the bottom of the inclined steel plate is fixedly connected to the bottom membrane plate, and the top of the inclined steel plate is connected to the first steel bar 3. Such an arrangement can increase the shear resistance of the floor slab, and the design of the inclined steel plate is also convenient for pouring and flowing of concrete 5, ensuring that the concrete 5 can evenly fill the entire floor slab structure.

[0036] The bottom of the inclined steel plate is connected to the bottom membrane steel plate 1 by spacing welding. This connection method provides stronger connection strength than spot welding and is suitable for bearing larger loads. The inclined steel plate is also provided with openings for pouring concrete 5. The openings are arranged in the horizontal direction to ensure the fluidity and uniformity of the concrete 5 when pouring.

[0037] In addition, the support layer 2 may use other methods such as triangular diagonal braces in addition to S-shaped support ribs or thin steel plates.

[0038] The corbel is a steel corbel 6, and the bottom membrane steel plate 1 is bolted or welded to the steel corbel 6. The bolt connection is convenient for disassembly and adjustment, while the welding connection provides stronger stability. The most suitable connection method can be selected according to specific construction conditions and requirements. The support layer 2 is provided with a lap steel bar 8, and one end of the lap steel bar 8 is embedded in the inner side of the double steel plate shear wall 7. This design can enhance the connection strength between the floor slab and the shear wall, and improve the seismic performance of the entire structure.

[0039] The bottom membrane plate is provided with shear nails, which are used to strengthen the connection between the bottom membrane plate and the concrete 5 and improve the overall stability of the floor slab. The use of shear nails can effectively transfer the shear force between the floor slab and the concrete 5, preventing the floor slab from sliding or deforming when subjected to force.

[0040] The bottom membrane plate is provided with a lifting lug 9, and the lifting lug 9 has a plurality of lifting lugs 9, which are arranged in the central part of the bottom membrane plate, and are arranged in a matrix form. This design can provide uniform lifting points to ensure the stability and safety of the floor during the lifting process. The arrangement of the lifting lugs 9 in the form of a matrix can evenly distribute the lifting force and reduce the deformation or damage of the floor caused by uneven lifting. After the lifting is completed, the lifting lugs 9 will be cast in the floor without being removed.

[0041] When the floor size is too large, the formwork-free floor is composed of multiple blocks, and the bottom membrane plates of the multiple blocks are connected by full penetration welding. This connection method provides extremely strong connection strength and ensures a firm connection between the blocks. The steel bars of the multiple blocks are overlapped by steel bars. This overlap method can enhance the integrity and continuity of the floor and improve the bearing capacity and seismic performance of the floor.

[0042] Example 2

[0043] This embodiment proposes a construction method for an assembled formwork-free floor slab applicable to a nuclear power plant as described in Embodiment 1, comprising:

[0044] 1. In the prefabrication stage, the thickness of the bottom membrane steel plate 1 is determined according to the span and the load on the plate. The bottom membrane steel plate 1 serves as a template and also replaces the lower layer of steel bars of the floor slab as a load-bearing member. Shear nails are set on the bottom membrane steel plate 1, and lifting ears 9 are set in appropriate areas.

[0045] 2. Install 2 S-shaped support bars or thin steel plates. The S-shaped support bars are bent according to the spacing of the upper first steel bars 3, and the lower part is spot welded to the bottom membrane steel plate 1. If pipes are installed, the relevant S-shaped support bars that interfere with the pipes can be cut off; when thin steel plates are used, the lower part and the bottom membrane steel plate 1 can be welded at intervals.

[0046] 3. Further using the support layer 2 as support, install the first steel bar 3;

[0047] 4. Further, using the first steel bar 3 as support, install the second steel bar 4;

[0048] 5. After the installation is completed, the prefabricated component is completed. This component can be hoisted in an integrated manner. The hoisting device hangs the lifting lug 9 for hoisting operation, places it on the steel bracket 6, and then welds or bolts it;

[0049] 6. Install the overlapping steel bars 8 extending into the double steel plate shear wall 7;

[0050] 7. Pour concrete 5 to complete the production of prefabricated formwork-free floor slab.

[0051] This method simplifies the construction process, improves construction efficiency, and reduces the workload and time of on-site construction through prefabrication and modular design.

[0052] 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. An assembled formwork-free floor slab suitable for a nuclear power plant, used for installation on the corbels on the side of the shear wall, characterized in that: The formwork-free floor slab includes a bottom membrane plate, a supporting layer and a reinforcement layer; The edge of the bottom membrane plate is overlapped on the corbel and fixedly connected to the corbel; The support layer is arranged on the bottom film plate, and comprises a connection portion located at the lower side and a support portion at the upper side, wherein the connection portion is fixedly connected to the bottom film plate; The steel bar layer is located on the upper side of the support layer, and includes a first steel bar and a second steel bar, wherein the first steel bar is connected to the supporting portion of the support bar, and the second steel bar is located on the upper side of the second steel bar and is arranged perpendicular to the first steel bar.

2. The assembled formwork-free floor slab suitable for a nuclear power plant according to claim 1, characterized in that: The support layer is a 2S-type support rib, and the support rib is double-bent along the transverse direction, and the bending spacing of the support rib is equal to the arrangement spacing of the first steel bars.

3. The assembled formwork-free floor slab suitable for a nuclear power plant as claimed in claim 2, characterized in that: The bottom membrane plate is a bottom membrane steel plate, and the bottom of the supporting rib is spot-welded to the bottom membrane steel plate.

4. The assembled formwork-free floor slab suitable for a nuclear power plant according to claim 1, characterized in that: The supporting layer is a plurality of parallel arranged inclined steel plates, the inclined steel plates are at a predetermined angle to the bottom membrane plate, the bottom of the inclined steel plates is fixedly connected to the bottom membrane plate, and the top of the inclined steel plates is connected to the first steel bar.

5. The assembled formwork-free floor slab suitable for a nuclear power plant as claimed in claim 4, characterized in that: The bottom membrane plate is a bottom membrane steel plate, the bottom of the inclined steel plate is connected to the bottom membrane steel plate by using spacing welding, and the inclined steel plate is also provided with openings for pouring concrete, and the openings are arranged along the horizontal direction.

6. The assembled formwork-free floor slab suitable for a nuclear power plant according to claim 1, characterized in that: The corbel is a steel corbel, the bottom membrane plate is a bottom membrane steel plate, the bottom membrane steel plate is bolted or welded to the steel corbel, the shear wall is a double steel plate shear wall, lap steel bars are arranged on the supporting layer, and one end of the lap steel bars is embedded in the inner side of the double steel plate shear wall.

7. The assembled formwork-free floor slab suitable for a nuclear power plant according to claim 1, characterized in that: The bottom membrane plate is provided with shear nails.

8. The assembled formwork-free floor slab suitable for a nuclear power plant according to claim 1, characterized in that: The bottom membrane plate is provided with a plurality of lifting ears, which are arranged at the center of the bottom membrane plate and are arranged in a matrix form.

9. The assembled formwork-free floor slab suitable for a nuclear power plant according to claim 1, characterized in that: The formwork-free floor slab is composed of a plurality of blocks, the bottom membrane plates of the plurality of blocks are connected by full penetration welding, and the steel bar layers of the plurality of blocks are overlapped by steel bars.

10. A construction method for an assembled formwork-free floor applicable to a nuclear power plant as claimed in any one of claims 1 to 9, characterized in that: include: During the prefabrication stage, shear studs and lifting lugs are set on the bottom membrane steel plate; Install support ribs or inclined steel plates. When support ribs are used, the support ribs are bent according to the spacing of the first upper steel bars, and the lower part is spot welded to the bottom membrane steel plate; when inclined steel plates are used, the lower part of the inclined steel plate is welded to the bottom membrane steel plate by spacing; the first steel bars are installed with the support layer as support, and the second steel bars are installed with the first steel bars as support; Hoist the formwork-free floor slab and place it on the steel brackets and connect them, and install the lap reinforcement extending into the double steel plate shear wall; Pour concrete to complete the production of prefabricated formwork-free floor slabs.

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