A double-sided slab with close connection and no reinforcement on four sides
By adopting a densely-stitched bidirectional plate design with no ribs on four sides in the reinforced steel truss stacked plate, combined with the use of overlapping steel bars and steel trusses, the problem of ribs on four sides in the existing technology is solved, the construction efficiency and quality are improved, the cost is reduced, and it is suitable for underground garage roof panel design.
Patent Information
- Application Number
- CN202421536119.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The existing reinforced truss laminated plates have problems with four sides of ribs in the bidirectional plate design, resulting in low construction efficiency, high cost, and high cost due to manufacturing processes.
The design of densely-split joint overlapping bidirectional plates is adopted with no ribs on four sides. By setting up columns and main beams, overlapping steel bars are used to ensure the bidirectional stress capacity of the plate body. At the same time, steel bar trusses parallel to the joints are set at the plate joints to enhance integrity and stiffness.
It realizes a bidirectional plate design with no ribs on four sides, improves construction efficiency and quality, reduces costs, and is suitable for the construction of large-area prefabricated laminated plates, especially for the design of underground garage roof panels.
Smart Images
Figure CN222745403U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a composite bidirectional plate with four sides without reinforcement and tightly connected, belonging to the technical field of composite plates. Background Art
[0002] In prefabricated concrete structures, reinforced truss composite slabs are the most widely used. However, from the perspective of existing technical applications, at present, truss reinforced composite slabs mainly adopt single slabs with reinforcement on four sides and multiple slabs spliced in an integral cast-in-place joint structure. The connection of reinforced truss two-way composite slabs often adopts the form of reserved cast-in-place strips with a width of about 300mm. The formwork and support of the cast-in-place strips need to be set up on site, which leads to low construction efficiency. In addition, the protruding steel bars of the prefabricated bottom slabs seriously collide with the steel bars of adjacent beams, walls, and columns during the construction and installation process, affecting the construction quality and speed. These two problems have long plagued the development of the industry. Composite slabs with protruding steel bars have problems such as poor economy and low efficiency in terms of component manufacturing, transportation, and on-site installation, which are also the main factors for high costs. From the current market perspective, various types of composite slabs with unreinforced bottom plates have gradually emerged, such as prestressed concrete steel tube truss composite slabs, bracket prestressed concrete composite slabs, etc. These composite slabs are unreinforced and realized by prestressed technology. The use of prestressed technology can control the thickness of the bottom plate to 35-40mm, but these types of composite slabs are basically designed as one-way slabs. There will still be prestressed "beard bars" at the support end, and transverse steel bars need to be arranged throughout the vertical plate seams. The transverse steel bars need to calculate the thickness of the bottom plate according to the thickness of the protective layer to balance the force perpendicular to the direction of the composite slab. At present, this type of composite slab is relatively expensive due to the manufacturing process.
[0003] Currently, there is no clear design method and construction requirement for the design of two-way slabs with traditional prefabricated bottom slabs without reinforcement and closely connected composite slabs, and the requirements for the thickness of the cast-in-place layer are too strict. For example, Article 5.5.3 of the national standard "Technical Standard for Prefabricated Concrete Buildings" (GB / T 51231-2016) stipulates that when the thickness of the post-cast composite layer of the truss reinforced concrete composite slab is not less than 100mm and not less than 1.5 times the thickness of the prefabricated layer, the longitudinal reinforcement at the composite slab support may not extend into the support, and the overlap method is used to anchor the support in the post-cast composite layer. That is, the slab needs to be at least 160mm thick, which greatly increases the deadweight and cost of the slab. This is also the biggest bottleneck restricting the development of traditional prefabricated composite slabs (60mm thick) without reinforcement. Utility Model Content
[0004] In order to solve the above problems, the present application proposes a composite two-way slab with dense connection and no reinforcement on the four sides, so that the four sides of the traditional 60mm thick precast concrete composite slab do not need reinforcement, and can be used for the design of two-way slabs.
[0005] The utility model provides the following technical solutions:
[0006] A four-side non-ribbed closely spliced and laminated bidirectional plate, comprising at least two first plates arranged adjacent to each other in the transverse direction and at least two second plates arranged adjacent to each other in the transverse direction, the first plates and the second plates being arranged adjacent to each other in the longitudinal direction, four columns being arranged at the four corners of each first plate and the second plate, two adjacent first plates and / or second plates sharing two columns, two adjacent long sides of the first plate and the second plate and the other long side of the second plate being connected to the columns via a first main beam, the other long side of the first plate being connected to the columns via a second main beam, the short side of the first plate being connected to the columns via a third main beam, and the short side of the second plate being connected to the columns via a fourth main beam;
[0007] The first plate body and the first main beam are connected as well as the second plate body and the first main beam are connected by the first lap steel bar, the first plate body and the second main beam are connected by the second lap steel bar, the first plate body and the third main beam are connected by the third lap steel bar, the second plate body and the fourth main beam are connected by the fourth lap steel bar, the first plate body is provided with a fifth lap steel bar, and the second plate body is provided with a sixth lap steel bar.
[0008] Optionally, the first lap steel bar passes through the first main beam to connect the first plate body and the second plate body which are adjacent to each other in the longitudinal direction, the third lap steel bar passes through the third main beam to connect the two first plate bodies which are adjacent to each other in the transverse direction, and the fourth lap steel bar passes through the fourth main beam to connect the two second plate bodies which are adjacent to each other in the transverse direction.
[0009] Optionally, the first plate body and the second plate body are both three-piece structures, the first plate body includes two first panels and one second panel, the second panel is arranged between the two first panels, and the second plate body includes two third panels and one fourth panel, the fourth panel is arranged between the two third panels.
[0010] Optionally, the first panel, the second panel and the first panel that are arranged adjacent to each other in sequence are closely connected by the fifth lap steel bar, and the third panel, the fourth panel and the third panel that are arranged adjacent to each other in sequence are closely connected by the sixth lap steel bar.
[0011] Optionally, a plurality of steel trusses are arranged along the long sides of the first panel, the second panel, the third panel and the fourth panel, and each of the first panel, the second panel, the third panel and the fourth panel includes at least six steel trusses.
[0012] Optionally, the steel truss includes an upper chord steel bar, a web member steel bar and a lower chord steel bar, and the upper chord steel bar and the lower chord steel bar are respectively located at the upper end and the lower end of the web member steel bar.
[0013] Optionally, the horizontal distances from the upper chord steel bars of the steel truss to the edges of the first panel, the second panel, the third panel and the fourth panel are not greater than 300 mm, and the spacing between the upper chord steel bars of adjacent steel trusses is not greater than 600 mm.
[0014] Optionally, the steel bar truss, the first lap steel bar, the second lap steel bar, the third lap steel bar, the fourth lap steel bar, the fifth lap steel bar and the sixth lap steel bar do not extend out of the composite slab surface.
[0015] Optionally, the diameters of the upper chord steel bars and the lower chord steel bars are not less than 8 mm, and the diameter of the web bar steel bars is not less than 4 mm;
[0016] The center distance between the web reinforcement and the adjacent welding points of the upper chord reinforcement and the lower chord reinforcement shall not exceed 200mm;
[0017] The width of the steel truss is not less than 60 mm and not more than 110 mm;
[0018] The height of the steel bar truss is not less than 70 mm and not more than 400 mm.
[0019] Optionally, the first lap steel bar is D14@100, the second lap steel bar is D12@110, the third lap steel bar is D10@150, the fourth lap steel bar is D12@130, the fifth lap steel bar is D12@150, and the sixth lap steel bar is D14@100.
[0020] The beneficial effects of this application include but are not limited to:
[0021] The present application provides a composite two-way slab with no reinforcement on four sides and closely connected. For a slab span designed as a two-way slab, and at least two composite slabs with no reinforcement on four sides are divided in the slab span, additional lap steel bars are reasonably arranged at the joint position. The additional steel bars are different from the structural additional steel bars arranged in the separated joint. The additional lap steel bars are indirectly overlapped with the longitudinal steel bars in the truss prefabricated slab, and can resist the shear force and bending moment at the joint. By arranging a steel truss parallel to the joint position, the integrity of the floor slab at the slab joint can be enhanced, the rigidity of the floor slab can be ensured to be continuous, and the internal force of the slab can be effectively transmitted. Overall, although the composite slab has no reinforcement and closely connected integral joint design, the cost is increased to a certain extent compared with the integral joint, but compared with the traditional integral joint, ≥200mm is generally reserved, and the cost of construction measures at this position is much greater than the cost increase of steel bars in the closely connected integral joint. At the same time, the design without reinforcement is convenient for production and hoisting, and is also convenient for the construction of steel bars on the upper part of the composite beam. Its construction speed and efficiency are far better than those of the traditional integral joint, and the cost is also lower than that of the integral joint. Applying the composite bidirectional slabs with no reinforcement on the four sides to the roof of underground garages is not only in line with the development direction of prefabricated underground garages and suitable for the construction of large-area prefabricated composite slabs, but also has the characteristics of bidirectional force bearing without reinforcement on the four sides, which makes the design of the garage roof more optimized and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0023] Figure 1 This is a structural schematic diagram of a laminated bidirectional slab with no reinforcement on four sides involved in an embodiment of the present application;
[0024] Figure 2 A distribution diagram of the steel bar trusses in the first plate body involved in the embodiment of the present application;
[0025] Figure 3 This is a schematic diagram of the structure of a steel bar truss involved in an embodiment of the present application;
[0026] List of parts and reference numerals:
[0027] 1. The first plate, 2. The second plate, 3. The column, 4. The first main beam, 5. The second main beam, 6. The third main beam, 7. The fourth main beam, 8. The first lap steel bar, 9. The second lap steel bar, 10. The third lap steel bar, 11. The fourth lap steel bar, 12. The fifth lap steel bar, 13. The sixth lap steel bar, 14. The first panel, 15. The second panel, 16. The third panel, 17. The fourth panel, 18. The steel truss, 19. The upper chord steel bar, 20. The web member steel bar, 21. The lower chord steel bar. DETAILED DESCRIPTION
[0028] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.
[0029] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.
[0031] In addition, in the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; 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 this application can be understood according to specific circumstances.
[0034] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.
[0035] Reference Figure 1-3 , introduces the use of traditional prefabricated base plate without reinforcement and closely connected composite plates for two-way plate design, in which the thickness of the unreinforced steel truss composite plate is 60mm, and the thickness of the post-cast composite layer is 190mm.
[0036] The four-side non-reinforced closely-joined composite two-way slab according to the present embodiment comprises at least two first slab bodies 1 arranged adjacent to each other in the transverse direction and at least two second slab bodies 2 arranged adjacent to each other in the transverse direction, the first slab bodies 1 and the second slab bodies 2 are arranged adjacent to each other in the longitudinal direction, four columns 3 are arranged at the four corners of each first slab body 1 and the second slab body 2, two adjacent first slab bodies 1 and / or second slab bodies 2 share two columns 3, the two adjacent long sides of the first slab body 1 and the second slab body 2 and the other long side of the second slab body 2 are connected to the columns 3 through the first main beam 4, the other long side of the first slab body 1 is connected to the columns 3 through the second main beam 5, the short side of the first slab body 1 is connected to the columns 3 through the third main beam 6, and the short side of the second slab body 2 is connected to the columns 3 through the fourth main beam 7; both slab bodies are supported by four-side fixed supports, the longer side is no larger than the shorter side by 2, and both can be calculated as two-way slabs according to the requirements in GB50010-2010 "Code for Design of Concrete Structures".
[0037] The first plate body 1 and the first main beam 4 as well as the second plate body 2 and the first main beam 4 are connected by the first lap steel bar 8, the first plate body 1 and the second main beam 5 are connected by the second lap steel bar 9, the first plate body 1 and the third main beam 6 are connected by the third lap steel bar 10, the second plate body 2 and the fourth main beam 7 are connected by the fourth lap steel bar 11, the first plate body 1 is provided with a fifth lap steel bar 12, and the second plate body 2 is provided with a sixth lap steel bar 13; the lap steel bars are located on the joint surface of the post-cast composite layer and the prefabricated composite plate, and the lap steel bars perpendicular to the joints are arranged at the joints to ensure the bending bearing capacity at the joints and control the crack width, so that the garage roof achieves a waterproof and anti-seepage effect.
[0038] As an implementation method, the first lap steel bar 8 is D14@100, the second lap steel bar 9 is D12@110, the third lap steel bar 10 is D10@150, the fourth lap steel bar 11 is D12@130, the fifth lap steel bar 12 is D12@150, and the sixth lap steel bar 13 is D14@100; the floor slab force-bearing steel bars selected in this application are all grade 3 steel except the web steel bars 20, and the height of the section that bears negative bending moment under the action of vertical load at the floor slab support is taken as the thickness of the truss composite plate, so the first lap steel bar 8 is consistent with the sixth lap steel bar 13.
[0039] As an implementation mode, the first lap steel bar 8 passes through the first main beam 4 to connect the first plate body 1 and the second plate body 2 which are adjacent to each other in the longitudinal direction, the third lap steel bar 10 passes through the third main beam 6 to connect the two first plate bodies 1 which are adjacent to each other in the transverse direction, and the fourth lap steel bar 11 passes through the fourth main beam 7 to connect the two second plate bodies 2 which are adjacent to each other in the transverse direction; the lap steel bars can further enhance the connection strength of the two adjacent plate bodies after pouring concrete.
[0040] As an implementation mode, in order to reduce the specifications of the composite panels, facilitate factory production, and reduce the cost of producing molds separately, the present application divides the standard span garage roof composite panels into a first panel body 1 and a second panel body 2; wherein the first panel body 1 and the second panel body 2 are both three-piece structures, the first panel body 1 includes two first panels 14 and one second panel 15, the second panel 15 is arranged between the two first panels 14, the second panel body 2 includes two third panels 16 and one fourth panel 17, the fourth panel 17 is arranged between the two third panels 16.
[0041] As an implementation mode, the first panel 14, the second panel 15 and the first panel 14 which are arranged adjacent to each other in sequence are closely connected by the fifth lap steel bar 12, and the third panel 16, the fourth panel 17 and the third panel 16 which are arranged adjacent to each other in sequence are closely connected by the sixth lap steel bar 13; this not only enhances the structural stability of the composite panel and improves its bearing capacity, but also achieves a waterproof and anti-seepage effect.
[0042] As an implementation mode, a plurality of steel trusses 18 are arranged along the long side direction of the first panel 14, the second panel 15, the third panel 16 and the fourth panel 17, and each of the first panel 14, the second panel 15, the third panel 16 and the fourth panel 17 includes at least six steel trusses 18; preferably six, which meets the requirements for the arrangement of steel trusses in T_CECS715-2020 "Technical Code for Application of Steel Truss Concrete Composite Slabs" and JGJ1-2014 "Technical Code for Prefabricated Concrete Structures".
[0043] As an implementation method, the steel truss 18 includes an upper chord steel bar 19, a web steel bar 20 and a lower chord steel bar 21, wherein the upper chord steel bar 19 and the lower chord steel bar 21 are respectively located at the upper and lower ends of the web steel bar 20; the integrity of the floor slab at the slab joints can be enhanced, the continuous stiffness of the floor slab can be ensured, and the internal forces of the slab can be effectively transmitted.
[0044] As an implementation method, the horizontal distance from the upper chord steel bars 19 of the steel truss 18 to the edges of the first panel 14, the second panel 15, the third panel 16 and the fourth panel 17 is no more than 300 mm, and the spacing between the upper chord steel bars 19 of adjacent steel trusses 18 is no more than 600 mm, meeting the requirements of relevant regulations.
[0045] Preferably, the horizontal distances from the upper chord steel bars 19 of the steel truss 18 to the edges of the first panel 14, the second panel 15, the third panel 16 and the fourth panel 17 are all 200 mm, and the spacing between the upper chord steel bars 19 of adjacent steel trusses 18 is all 400 mm.
[0046] As an implementation method, the diameters of the upper chord steel bars 19 and the lower chord steel bars 21 are not less than 8 mm, and the diameter of the web bar steel bars 20 is not less than 4 mm;
[0047] The center distance between the web reinforcement 20 and the adjacent welding points of the upper chord reinforcement 19 and the lower chord reinforcement 21 is not greater than 200 mm;
[0048] The width of the steel bar truss 18 is not less than 60 mm and not more than 110 mm;
[0049] The height of the steel bar truss 18 is not less than 70 mm and not more than 400 mm;
[0050] Meets the structural requirements of relevant regulations.
[0051] Preferably, the diameter of the upper chord steel bar 19 is 14 mm, the diameter of the lower chord steel bar 21 is 12 mm, and the diameter of the web bar steel bar 20 is 10 mm;
[0052] The center distance between the web reinforcement 20 and the adjacent welding points of the upper chord reinforcement 19 and the lower chord reinforcement 21 is 200 mm;
[0053] The width of the steel truss 18 is 100 mm;
[0054] The height of the steel bar truss 18 is 200 mm.
[0055] As an implementation method, the steel truss 18, the first lap steel bar 8, the second lap steel bar 9, the third lap steel bar 10, the fourth lap steel bar 11, the fifth lap steel bar 12 and the sixth lap steel bar 13 do not extend out of the composite slab surface, thereby improving the efficiency of production and construction.
[0056] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.
[0057] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims
1. A double-sided slab with no reinforcement on four sides, characterized in that: The invention comprises at least two first plates arranged adjacent to each other in the transverse direction and at least two second plates arranged adjacent to each other in the transverse direction, wherein the first plates and the second plates are arranged adjacent to each other in the longitudinal direction, four columns are arranged at four corners of each first plate and the second plate, two adjacent first plates and / or second plates share two columns, two adjacent long sides of the first plate and the second plate and the other long side of the second plate are connected to the columns through a first main beam, the other long side of the first plate is connected to the column through a second main beam, the short side of the first plate is connected to the column through a third main beam, and the short side of the second plate is connected to the column through a fourth main beam; The first plate body and the first main beam are connected as well as the second plate body and the first main beam are connected by the first lap steel bar, the first plate body and the second main beam are connected by the second lap steel bar, the first plate body and the third main beam are connected by the third lap steel bar, the second plate body and the fourth main beam are connected by the fourth lap steel bar, the first plate body is provided with a fifth lap steel bar, and the second plate body is provided with a sixth lap steel bar.
2. The four-side non-reinforced closely spliced and laminated bidirectional slab according to claim 1 is characterized in that: The first lap steel bar passes through the first main beam to connect the first plate body and the second plate body which are adjacent to each other in the longitudinal direction, the third lap steel bar passes through the third main beam to connect the two first plate bodies which are adjacent to each other in the transverse direction, and the fourth lap steel bar passes through the fourth main beam to connect the two second plate bodies which are adjacent to each other in the transverse direction.
3. The four-side non-reinforced closely spliced and laminated bidirectional slab according to claim 1 is characterized in that: The first plate body and the second plate body are both three-piece structures, the first plate body includes two first panels and one second panel, the second panel is arranged between the two first panels, the second plate body includes two third panels and one fourth panel, the fourth panel is arranged between the two third panels.
4. The four-side non-reinforced closely spliced and laminated bidirectional slab according to claim 3 is characterized in that: The first panel, the second panel and the first panel which are arranged adjacent to each other in sequence are closely connected by the fifth lap steel bar, and the third panel, the fourth panel and the third panel which are arranged adjacent to each other in sequence are closely connected by the sixth lap steel bar.
5. The four-side non-reinforced closely spliced and laminated bidirectional slab according to claim 3 is characterized in that: A plurality of steel trusses are arranged along the long sides of the first panel, the second panel, the third panel and the fourth panel, and each of the first panel, the second panel, the third panel and the fourth panel includes at least six steel trusses.
6. The four-side non-reinforced closely spliced and laminated bidirectional slab according to claim 5 is characterized in that: The steel bar truss comprises an upper chord steel bar, a web bar steel bar and a lower chord steel bar, wherein the upper chord steel bar and the lower chord steel bar are respectively located at the upper end and the lower end of the web bar steel bar.
7. The four-side non-reinforced closely spliced and laminated bidirectional slab according to claim 6 is characterized in that: The horizontal distances from the upper chord steel bars of the steel truss to the edges of the first, second, third and fourth panels are no more than 300 mm, and the spacing between the upper chord steel bars of adjacent steel trusses is no more than 600 mm.
8. The four-side non-reinforced closely spliced and laminated bidirectional slab according to claim 5 is characterized in that: The steel truss, the first lap steel bar, the second lap steel bar, the third lap steel bar, the fourth lap steel bar, the fifth lap steel bar and the sixth lap steel bar do not extend out of the composite slab surface.
9. The four-side non-reinforced closely spliced and laminated bidirectional slab according to claim 6, characterized in that: The diameters of the upper and lower chord steel bars are not less than 8 mm, and the diameter of the web bar steel bars is not less than 4 mm; The center distance between the web reinforcement and the adjacent welding points of the upper chord reinforcement and the lower chord reinforcement shall not exceed 200mm; The width of the steel truss is not less than 60 mm and not more than 110 mm; The height of the steel bar truss is not less than 70 mm and not more than 400 mm.
10. The four-side non-reinforced closely spliced and laminated bidirectional slab according to claim 1, characterized in that: The first lap steel bar is D14@100, the second lap steel bar is D12@110, the third lap steel bar is D10@150, the fourth lap steel bar is D12@130, the fifth lap steel bar is D12@150, and the sixth lap steel bar is D14@100.