Prefabricated part for super-thick floor slab

Abstract

The prefabricated part for the super-thick floor slab comprises a prefabricated bottom plate, a plurality of transversely-distributed steel bars, a plurality of longitudinal steel bar trusses and a plurality of concrete ribs, the bottoms of the longitudinal steel bar trusses are embedded in the prefabricated bottom plate, and the tops of the longitudinal steel bar trusses are embedded in the concrete ribs. The longitudinal directions of the concrete ribs and the longitudinal steel bar trusses are parallel to the longitudinal direction of the prefabricated bottom plate, and the construction span of the prefabricated part can be increased. In the construction stage, the prefabricated bottom plate, the concrete ribs and the longitudinal bar steel bar trusses serve as a whole and jointly bear the self-weight of components, the self-weight of wet concrete, the self-weight of additional steel bars and construction live loads in the construction stage. The prefabricated part and post-poured concrete are well combined in the using stage, and the purpose of performance equivalent to cast-in-place can be achieved. The structure is particularly suitable for super-thick floor slabs with the thickness being 300 mm or above, has the advantages of being light in weight, reasonable in stress, free of supporting and convenient to construct, the construction period can be effectively shortened, the transportation cost is reduced, and the advantages of an assembly type structure are fully exerted.

Description

Technical Field

[0001] The present disclosure relates to the field of nuclear power plant structures, and in particular to a prefabricated component for ultra-thick floor slabs. Background Art

[0002] At present, the concrete structure of nuclear power plants is generally cast-in-place reinforced concrete, which requires a large amount of reinforcement engineering, formwork engineering and cast-in-place concrete engineering work on site. Nuclear power plants have thick floor slabs, heavy loads, high structural layers, and small available construction space. The following prominent problems exist when using traditional cast-in-place methods:

[0003] 1) Large equipment needs to be in place before floor construction, and the equipment is close to the surrounding walls, resulting in limited available construction space under the floor. There are many practical difficulties in setting up traditional formwork and temporary support systems.

[0004] 2) The structural layer is tall and the construction load is large. When using traditional formwork and temporary support systems, the temporary support materials are large in amount and the structure is complex, the construction measures cost is high, and there may be safety risks.

[0005] 3) When using the traditional cast-in-place construction method, the workload of formwork and temporary support is large, the workload of on-site steel bar tying is large, and there are problems such as long construction period, large labor demand, material waste and serious environmental pollution. Utility Model Content

[0006] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0007] To this end, the present invention provides a prefabricated component for ultra-thick floor slabs, which is particularly suitable for ultra-thick floor slabs with a thickness of 300 mm and above. It can realize the combined stress of the concrete base plate and the concrete ribs, and has the advantages of light weight, reasonable stress, no support, and convenient construction. It can effectively shorten the construction period, reduce transportation costs, give full play to the advantages of prefabricated structures, and improve the industrialization level of nuclear power plant construction.

[0008] In order to achieve the above objectives, the present disclosure adopts the following technical solutions:

[0009] The present disclosure provides a prefabricated component for an ultra-thick floor slab, comprising a prefabricated bottom slab and a plurality of transversely distributed steel bars, longitudinal steel bar trusses and concrete ribs;

[0010] The prefabricated bottom plate is a concrete plate, with its long side as the longitudinal direction and its short side as the transverse direction;

[0011] The length direction of each concrete rib is parallel to the longitudinal direction of the precast bottom plate, each concrete rib is located above the precast bottom plate and is arranged at intervals along the transverse direction of the precast bottom plate, and each concrete rib is connected to the precast bottom plate through a corresponding one of the longitudinal steel bar trusses;

[0012] The length direction of each longitudinal steel bar truss is parallel to the longitudinal direction of the precast bottom plate, and each longitudinal steel bar truss is arranged at intervals along the transverse direction of the precast bottom plate. Each longitudinal steel bar truss is respectively composed of an upper longitudinal bar, a lower longitudinal bar and a plurality of annular steel bars; the upper longitudinal bar is located in a corresponding concrete rib, and the lower longitudinal bar is located in the precast bottom plate. Both ends of the upper longitudinal bar and the lower longitudinal bar protrude from the ends of the concrete rib and the precast bottom plate to form a first overhanging section, and the top of each annular steel bar is sleeved on the upper longitudinal bar and the bottom is sleeved on the lower longitudinal bar, and each annular steel bar is sequentially arranged along the length direction of the longitudinal bar;

[0013] The length direction of each transverse distribution steel bar is parallel to the transverse direction of the precast base plate, and each transverse distribution steel bar is arranged at intervals along the longitudinal direction of the precast base plate. The transverse distribution steel bars are divided into upper transverse distribution steel bars and lower transverse distribution steel bars. The lower transverse distribution steel bars are embedded in the precast base plate and arranged on the top of the lower longitudinal bars; the upper transverse distribution steel bars are arranged on the top of the upper longitudinal bars and pass through the concrete ribs, and both ends of each transverse distribution steel bar protrude from the concrete ribs and the ends of the precast base plate to form a second overhanging section.

[0014] In some embodiments, the prefabricated base plate is rectangular.

[0015] In some embodiments, each concrete rib is in strip shape and is arranged along the longitudinal length of the prefabricated base plate.

[0016] In some embodiments, the length of the prefabricated bottom plate is 3m to 10m, and the net distance between two adjacent concrete ribs is 200mm to 400mm.

[0017] In some embodiments, the annular steel bars are all rectangular, and the annular steel bars in a single longitudinal steel bar truss are arranged along the length direction of the longitudinal steel bar truss and are connected end to end in sequence to form a triangular truss.

[0018] In some embodiments, the first outwardly extending section of each upper longitudinal rib and the lower longitudinal rib is L-shaped or straight-shaped.

[0019] In some embodiments, the second extending section of each transversely distributed steel bar is L-shaped or straight-shaped.

[0020] In some embodiments, additional longitudinal reinforcement located at the bottom of the transverse distributed reinforcement is provided between two adjacent longitudinal reinforcement trusses according to the stress requirements.

[0021] In some embodiments, the prefabricated components are used for floor slabs with a thickness of 300 mm and above.

[0022] The present disclosure has the following advantages:

[0023] (1) Only strip concrete ribs are set on the top of the longitudinal steel trusses, which can effectively reduce the weight of the prefabricated components. The prefabricated components of this scheme are light in weight and have reasonable stress.

[0024] (2) The combined load-bearing of longitudinal steel trusses and concrete ribs can greatly increase the unsupported construction span, achieve construction without support or with minimal support for larger spans, and save measures costs.

[0025] (3) No formwork is required or less formwork is required during the construction phase, which simplifies the construction difficulty and saves construction costs.

[0026] (4) During the use stage, the contact area between the post-poured concrete and the precast component concrete is large, the bonding performance is good, and the integrity is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional schematic diagram of a prefabricated component for an ultra-thick floor slab provided in an embodiment of the present disclosure.

[0028] Figure 2 for Figure 1 A top view of the precast element shown.

[0029] Figure 3 for Figure 2 AA section view in.

[0030] Figure 4 for Figure 1 3D schematic diagram of the longitudinal reinforcement trusses in the precast component shown.

[0031] Figure 5 for Figure 2 BB cross-section diagram in.

[0032] Figure 6 This is a schematic cross-sectional view of a prefabricated component provided by an embodiment of the present disclosure when more longitudinal reinforcements are required.

[0033] In the figure:

[0034] 1. Prefabricated base plate;

[0035] 2. Transverse distribution steel bars; 21. Upper transverse distribution steel bars; 22. Lower transverse distribution steel bars; 23. Second extension section;

[0036] 3. Longitudinal steel bar truss; 31. Upper longitudinal bars; 32. Lower longitudinal bars; 33. Circular bars; 34. First extension section; 35. Additional upper longitudinal bars; 36. Additional lower longitudinal bars;

[0037] 4. Concrete ribs. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[0040] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the basis or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0042] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] See also Figure 1 to Figure 5 , the prefabricated component of the embodiment of the present disclosure includes a prefabricated bottom plate 1 and a number of transversely distributed steel bars, longitudinal steel bar trusses 3 and concrete ribs 4;

[0044] The precast base plate 1 is a rectangular concrete plate, with the long side of the precast base plate 1 as the longitudinal direction and the short side as the transverse direction;

[0045] Each concrete rib 4 is strip-shaped, and the length direction of the concrete rib 4 is parallel to the longitudinal direction of the precast bottom plate 1. Each concrete rib 4 is located above the precast bottom plate 1 and is arranged at intervals along the transverse direction of the precast bottom plate 1. Each concrete rib 4 is connected to the precast bottom plate 1 through a corresponding longitudinal steel truss 3.

[0046] The length direction of each longitudinal steel bar truss 3 is parallel to the longitudinal direction of the precast bottom plate 1. Each longitudinal steel bar truss 3 is arranged at intervals along the transverse direction of the precast bottom plate 1. The bottom of the longitudinal steel bar truss 3 is located in the precast bottom plate 1, and the top is located in a corresponding concrete rib 4. Each longitudinal steel bar truss 3 is respectively composed of an upper longitudinal bar 31, a lower longitudinal bar 32 and a plurality of annular steel bars 33; the upper longitudinal bar 31 is located in a corresponding concrete rib 4, and the lower longitudinal bar 32 is located in the precast bottom plate 1. The ends of the upper longitudinal bar 31 and the lower longitudinal bar 32 protrude from the ends of the concrete rib 4 and the precast bottom plate 1 to form an L-shaped first overhanging section 34. The top of each annular steel bar 33 is sleeved on the upper longitudinal bar 31, and the bottom is sleeved on the lower longitudinal bar 32, and each annular steel bar 33 is sequentially arranged along the length direction of the longitudinal bar;

[0047] The length direction of each transverse distribution steel bar is parallel to the transverse direction of the precast base plate 1, and each transverse distribution steel bar is arranged at intervals along the longitudinal direction of the precast base plate 1. The transverse distribution steel bars are divided into upper transverse distribution steel bars 21 and lower transverse distribution steel bars 22. The lower transverse distribution steel bars 22 are embedded in the precast base plate and arranged on the top of the lower longitudinal bars 32; the upper transverse distribution steel bars 21 are arranged on the top of the upper longitudinal bars 31 and pass through the concrete rib 4, and the two ends of the upper transverse distribution steel bars 21 and the lower transverse distribution steel bars 22 respectively protrude from the concrete rib 4 and the end of the precast base plate 1 to form an L-shaped second overhanging section 23.

[0048] In some embodiments, the prefabricated base plate 1 can play the role of not removing the formwork during the construction stage. During the stress stage, the prefabricated base plate 1 and the cast-in-place concrete form a whole and bear the stress together. The prefabricated base plate 1 is suitable for floors with a thickness of 300 mm or more and a length range of 3 m to 10 m. The width and thickness of the prefabricated base plate 1 need to be calculated and determined according to actual conditions.

[0049] In some embodiments, the concrete rib 4 is only arranged on the top of the longitudinal steel truss 3, which can effectively reduce the weight of the prefabricated component, making the prefabricated component light and reasonably stressed. In addition, the concrete rib 4 is arranged parallel to the longitudinal steel truss 3 and the lengths of the two are equal, which can increase the construction span of the prefabricated component. The net distance between two adjacent concrete ribs 4 is 200mm to 400mm; the width of a single concrete rib 4 and the net distance between the concrete rib 4 and the prefabricated bottom plate 1 need to be calculated and determined according to actual conditions.

[0050] In some embodiments, the precast base plate 1 is connected to each concrete rib 4 by a corresponding longitudinal steel truss 3. The longitudinal steel truss 3 is used as the force-bearing steel bar in the precast component, and its number and steel bar diameter should meet the force and structural requirements. During the construction phase, the precast base plate 1, concrete rib 4 and longitudinal steel truss 3 are a whole, jointly bearing the self-weight of the component, the self-weight of wet concrete, the self-weight of additional steel bars and the construction live load during the construction phase. During the use phase, the precast component and the post-cast concrete are well combined, and the goal of equivalent performance to cast-in-place can be achieved.

[0051] Furthermore, the annular steel bars 33 in the longitudinal steel bar truss 3 are all rectangular, and the annular steel bars 33 are arranged along the length direction of the longitudinal steel bar truss 3 and connected end to end in sequence to form a triangular truss. The annular steel bars 33 can serve as tension bars to improve the shear resistance, and can also support and connect the upper concrete ribs 4.

[0052] In some embodiments, the number, spacing and diameter of the transversely distributed reinforcement bars should meet the construction requirements.

[0053] Furthermore, the extended sections of the upper longitudinal reinforcement 31, the lower longitudinal reinforcement 32 and the two ends of the transverse distribution reinforcement are exposed on the outside of the concrete rib 4 and the prefabricated bottom plate 1, and are in an L-shape or a straight shape, and are used to connect the support and the adjacent floor slab. The length of the extended section needs to be calculated and determined according to the stress conditions. The extended section of each steel bar is preferably L-shaped. The structure of the L-shaped extended section can strengthen the anchorage of the steel bar and the concrete, and play a role in reducing the anchorage length of the extended section steel bar.

[0054] Further, see Figure 6 When the number of upper longitudinal bars 31 and lower longitudinal bars 32 required for the prefabricated component is large, additional upper longitudinal bars 35 and additional lower longitudinal bars 36 may be arranged between two adjacent longitudinal steel bar trusses 3 .

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0056] Although embodiments of the present disclosure have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A prefabricated component for an ultra-thick floor slab, characterized in that: It includes a prefabricated bottom plate and a number of transverse distribution steel bars, longitudinal steel trusses and concrete ribs; The prefabricated bottom plate is a concrete plate, with its long side as the longitudinal direction and its short side as the transverse direction; The length direction of each concrete rib is parallel to the longitudinal direction of the precast bottom plate, each concrete rib is located above the precast bottom plate and is arranged at intervals along the transverse direction of the precast bottom plate, and each concrete rib is connected to the precast bottom plate through a corresponding one of the longitudinal steel bar trusses; The length direction of each longitudinal steel bar truss is parallel to the longitudinal direction of the precast bottom plate, and each longitudinal steel bar truss is arranged at intervals along the transverse direction of the precast bottom plate. Each longitudinal steel bar truss is respectively composed of an upper longitudinal bar, a lower longitudinal bar and a plurality of annular steel bars; the upper longitudinal bar is located in a corresponding concrete rib, and the lower longitudinal bar is located in the precast bottom plate. Both ends of the upper longitudinal bar and the lower longitudinal bar protrude from the ends of the concrete rib and the precast bottom plate to form a first overhanging section, and the top of each annular steel bar is sleeved on the upper longitudinal bar and the bottom is sleeved on the lower longitudinal bar, and each annular steel bar is sequentially arranged along the length direction of the longitudinal bar; The length direction of each transverse distribution steel bar is parallel to the transverse direction of the precast base plate, and each transverse distribution steel bar is arranged at intervals along the longitudinal direction of the precast base plate. The transverse distribution steel bars are divided into upper transverse distribution steel bars and lower transverse distribution steel bars. The lower transverse distribution steel bars are embedded in the precast base plate and arranged on the top of the lower longitudinal bars; the upper transverse distribution steel bars are arranged on the top of the upper longitudinal bars and pass through the concrete ribs, and both ends of each transverse distribution steel bar protrude from the concrete ribs and the ends of the precast base plate to form a second overhanging section.

2. The prefabricated component according to claim 1, characterized in that: The prefabricated bottom plate is rectangular.

3. The prefabricated component according to claim 1, characterized in that: Each concrete rib is strip-shaped and is arranged along the longitudinal length of the prefabricated bottom plate.

4. The prefabricated component according to claim 1, characterized in that: The length of the prefabricated bottom plate is 3m-10m, and the net distance between two adjacent concrete ribs is 200mm-400mm.

5. The prefabricated component according to claim 1, characterized in that: The annular steel bars are all rectangular, and the annular steel bars in a single longitudinal steel bar truss are arranged along the length direction of the longitudinal steel bar truss and are connected end to end in sequence to form a triangular truss.

6. The prefabricated component according to claim 1, characterized in that: The first outward extension section of each upper longitudinal reinforcement and lower longitudinal reinforcement is L-shaped or straight-shaped.

7. The prefabricated component according to claim 1, characterized in that: The second outward extension section of each transverse distribution steel bar is L-shaped or straight-shaped.

8. The prefabricated component according to claim 1, characterized in that: According to the force requirements, additional longitudinal reinforcement is arranged between two adjacent longitudinal reinforcement trusses and located at the bottom of the transverse distribution reinforcement.

9. The prefabricated component according to any one of claims 1 to 8, characterized in that: The prefabricated components are used for floor slabs with a thickness of 300 mm and above.

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