Novel prestressed anti-crack laminated slab

Abstract

The utility model discloses a novel prestress anti-crack laminated slab which comprises a prefabricated bottom plate, a plurality of first longitudinal bars and first transverse bars are evenly arranged in the prefabricated bottom plate, and the novel prestress anti-crack laminated slab further comprises prestress steel bars which are evenly arranged in the prefabricated bottom plate and parallel to the first longitudinal bars. The external net rack is connected to the upper end of the prefabricated bottom plate and comprises a plurality of support ribs connected with the prefabricated bottom plate in an anchoring mode, the support ribs are longitudinally distributed in multiple columns, the upper ends of the support ribs are connected with second longitudinal ribs, the support ribs are transversely distributed in multiple columns, and the upper ends of the support ribs are connected with second transverse ribs; the support ribs are connected between every two adjacent first longitudinal ribs through clamping assemblies. The rigidity of the laminated slab is enhanced by arranging the prestressed steel bars, and the laminated slab is prevented from cracking; through the arrangement of the external net rack, the external net rack can serve as a part of support negative reinforcements of the prefabricated bottom plate, the rigidity of the prefabricated bottom plate during assembly is enhanced, the large-span requirement is met, an upper-layer truss does not need to be arranged, and steel bars and cost are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled buildings, in particular to a novel prestressed crack-resistant composite board. Background Art

[0002] The composite slab is a building slab produced by combining prefabrication and cast-in-place concrete. The prefabricated slab is combined with the cast-in-place concrete layer above it to form an integral composite slab. The main reinforcement of the prefabricated slab is the main reinforcement of the composite slab. The upper cast-in-place concrete layer is only equipped with negative bending moment steel bars and structural steel bars. The prefabricated slab is used as the bottom formwork of the cast-in-place concrete layer, and there is no need to support the formwork for the cast-in-place concrete layer. The bottom surface of the prefabricated slab is smooth and flat, and the ceiling of the lower floor (i.e., the bottom surface of the composite slab) does not need to be painted or plastered. This composite slab has the integrity of a cast-in-place reinforced concrete slab, and at the same time has the advantages of high rigidity, good crack resistance, no increase in steel consumption, saving formwork, and shortening the construction period of the entire project.

[0003] Patent document CN220117554U discloses a composite slab, and its technical solution includes: a concrete base plate, in which a plurality of longitudinal steel bars and transverse steel bars are evenly arranged, the longitudinal steel bars and the transverse steel bars are perpendicular to each other, the ends of the longitudinal steel bars and the transverse steel bars extend out of the concrete base plate, and the ends of the longitudinal steel bars and the transverse steel bars outside the concrete base plate are provided with hooks, a steel bar truss is provided on the top of the concrete base plate, and the bottom of the steel bar truss is built into the concrete base plate, and the longitudinal steel bars and transverse steel bars extending from the side of the concrete base plate are staggered with the corresponding longitudinal steel bars and transverse steel bars extending from the adjacent concrete base plate, and reinforcing steel bars are passed through the hooks, and the reinforcing steel bars are tied together with the longitudinal steel bars or transverse steel bars below them by iron wire. When the concrete is poured as a whole, the concrete is filled in the gap between the adjacent concrete base plates, thereby avoiding the gap between the composite slabs and increasing the integrity and strength of the composite slabs after splicing.

[0004] As in the prior art of the above-mentioned patent, a truss is arranged at the upper end of the prefabricated base plate to enhance the rigidity, and the connection between the existing truss and the prefabricated base plate is carried out by welding or binding the truss and the steel mesh frame of the prefabricated base plate during the prefabrication production of the prefabricated base plate, and then directly anchoring them together as the prefabricated base plate is cast. In actual operation, the above connection method greatly affects the production efficiency due to the structural tortuosity of the truss and the staggered layout of the steel mesh frame. Therefore, a new type of prestressed crack-resistant composite plate is urgently needed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a novel prestressed crack-resistant composite board to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A novel prestressed crack-resistant composite plate comprises a prefabricated base plate, in which a plurality of first longitudinal bars and first transverse bars are evenly arranged, wherein the first longitudinal bars are perpendicular to the first transverse bars, and further comprises: prestressed steel bars, which are evenly arranged in the prefabricated base plate and arranged parallel to the first longitudinal bars; an external grid, which is connected to the upper end of the prefabricated base plate, and comprises a plurality of support bars anchored to the prefabricated base plate, wherein the plurality of support bars are longitudinally distributed in a plurality of rows and the upper ends are connected to the second longitudinal bars, and the plurality of support bars are transversely distributed in a plurality of rows and the upper ends are connected to the second transverse bars; the support bars are connected between two adjacent first longitudinal bars by a clamping assembly without welding and binding.

[0008] Preferably, the ends of the first longitudinal reinforcement and the first transverse reinforcement are both extended out of the prefabricated bottom plate.

[0009] Preferably, the end of the first transverse rib is arranged in a hook shape.

[0010] Preferably, the ends of the prestressed steel bars are arranged in the prefabricated bottom plate.

[0011] Preferably, the engaging assembly comprises two opposite fork ribs arranged on the support rib, a push piece is movably arranged on the fork rib, and an elastic piece is connected between the two push pieces.

[0012] Preferably, a clamping seat is provided on the support rib in a liftable manner, a clamping hole matching the second longitudinal rib is provided on the clamping seat, and the lower end of the clamping seat is connected to the middle of the elastic sheet through a connecting piece.

[0013] Preferably, the inner diameter of the clamping hole is larger than the outer diameter of the second longitudinal rib.

[0014] Preferably, the second transverse rib is embedded in the socket.

[0015] In the above technical solution, the beneficial effects of the utility model are:

[0016] The novel prestressed crack-resistant composite slab enhances the rigidity of the composite slab by arranging prestressed steel bars, and can prevent the composite slab from cracking; through the arrangement of an external grid, it can be used as a part of the negative reinforcement of the support of the prefabricated bottom plate, thereby enhancing the rigidity of the prefabricated bottom plate during assembly and meeting the needs of large spans, and there is no need to arrange an upper truss on the prefabricated bottom plate, thus saving steel bars and costs. In addition, compared with traditional trusses, the external grid is simple in connection with the steel bar part of the prefabricated bottom plate, and by arranging a snap-fit ​​component, the support bars can be connected to the first longitudinal reinforcement without welding and binding, thereby facilitating the prefabrication production of the prefabricated bottom plate and improving production efficiency.

[0017] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0018] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the structure of a seam-type composite plate with an external steel mesh provided in an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure of the jointed composite board provided by the embodiment of the utility model

[0022] Figure 3 A schematic diagram of a steel reinforcement skeleton structure of a joint-type composite slab provided in an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the installation and coordination of the steel reinforcement skeleton and the external steel mesh of the joint-type composite plate provided in an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of the structure of a close-jointed composite board provided in an embodiment of the utility model;

[0025] Figure 6 A schematic diagram of the steel bar structure of a close-fitting composite slab provided in an embodiment of the utility model;

[0026] Figure 7 A schematic diagram of the joint structure of two laminated plates provided in an embodiment of the utility model;

[0027] Figure 8 A schematic diagram of a close-fitting structure of two superimposed plates provided in an embodiment of the utility model;

[0028] Fig. 9 A schematic diagram of the structure of the prefabricated bottom plate frame and the external steel mesh connected in a welding-free and binding-free manner provided in an embodiment of the utility model;

[0029] Fig.10 The embodiment of the utility model provides Fig. 9 Schematic diagram of the enlarged structure at point A in the middle.

[0030] Description of reference numerals:

[0031] 1. Prefabricated base plate; 2. First longitudinal reinforcement; 3. First transverse reinforcement; 4. Prestressed steel bars; 5. Support reinforcement; 6. Second longitudinal reinforcement; 7. Second transverse reinforcement; 8. Fork reinforcement; 9. Push plate; 10. Elastic plate; 11. Clamp seat; 12. Clamp hole; 13. Connector. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0033] See also Figure 1-10 A novel prestressed crack-resistant composite plate provided by an embodiment of the utility model comprises a prefabricated bottom plate 1, in which a plurality of first longitudinal bars 2 and first transverse bars 3 are evenly arranged, and the first longitudinal bars 2 are perpendicular to the first transverse bars 3, and also comprises: prestressed steel bars 4, which are evenly arranged in the prefabricated bottom plate 1 and arranged parallel to the first longitudinal bars 2; an external grid connected to the upper end of the prefabricated bottom plate 1, comprising a plurality of support bars 5 anchored and connected to the prefabricated bottom plate 1, the plurality of support bars 5 are longitudinally distributed in multiple rows and the upper ends are connected to second longitudinal bars 6, the plurality of support bars 5 are transversely distributed in multiple rows and the upper ends are connected to second transverse bars 7; the support bars 5 are connected between two adjacent first longitudinal bars 2 by a clamping assembly without welding and binding.

[0034] Specifically, the prefabricated base plate 1 is a concrete structure. In the prefabrication factory, concrete is poured into a mold surrounded by a mold platform to form the prefabricated base plate 1. The thickness of the prefabricated base plate 1 is 50-60mm. The staggered positions of the first longitudinal reinforcement 2 and the first transverse reinforcement 3 are welded or connected by steel wire tying. Multiple first longitudinal reinforcements 2 and first transverse reinforcements 3 are connected to form a steel mesh skeleton. The steel mesh skeleton is supported on a pad or a mold in the mold to ensure that it is completely covered in the concrete material of the prefabricated base plate 1 later. When the prefabricated base plate 1 is prefabricated, the two ends of the prestressed steel bar 4 are left long and connected to the tensioning equipment. Then, the prestressed steel bar 4 is kept under the specified tensioning force of the tensioning equipment until the concrete of the prefabricated base plate 1 is solidified and fixed, and then the prestressed steel bar 4 is prestressed. The prestressed steel bar 4 is disassembled from the tensioning equipment, and its end extending out of the precast base plate 1 is cut off; the prestressed steel bar 4 maintains prestressed contraction in the precast base plate 1, thereby preventing the precast base plate 1 from cracking; the lower end of the support bar 5 is arranged in the precast base plate 1, and during the precast production process of the precast base plate 1, it is connected to the first longitudinal bar 2, and the upper end of the support bar 5 is supported and exceeds the height of the upper surface of the precast base plate 1; the second longitudinal bar 6 and the second transverse bar 7 are perpendicular to each other; the second longitudinal bar 6 is pre-connected with the support bar 5, and then participates in the precast production of the precast base plate 1, and the second transverse bar 7 is connected to the support bar 5 after the precast production of the precast base plate 1, thereby reducing the impact on the concrete pouring process of the precast base plate 1. In actual use of this technical solution, the prestressed steel bars 4 can enhance the rigidity of the composite plate and prevent the composite plate from cracking; the external grid can be used as a part of the negative reinforcement of the support of the prefabricated base plate 1, to enhance the rigidity of the prefabricated base plate 1 during assembly and meet the needs of large spans, and there is no need to set an upper truss on the prefabricated base plate 1, thus saving steel bars and costs. In addition, compared with traditional trusses, the external grid is simple in connection with the steel bar part of the prefabricated base plate 1, and by setting a snap-fit ​​component, the support reinforcement 5 can be connected to the first longitudinal reinforcement 2 without welding and binding, thereby facilitating the prefabrication production of the prefabricated base plate 1 and improving production efficiency.

[0035] Compared with the prior art, a new type of prestressed crack-resistant composite plate proposed in the embodiment of the utility model enhances the rigidity of the composite plate by arranging prestressed steel bars 4, and can prevent the composite plate from cracking; through the arrangement of an external grid, it can be used as a part of the negative reinforcement of the support of the prefabricated base plate 1, enhances the rigidity of the prefabricated base plate 1 during assembly, meets the needs of large spans, and does not need to arrange an upper truss on the prefabricated base plate 1, thus saving steel bars and costs. In addition, compared with traditional trusses, the external grid is simple in connection with the steel bar part of the prefabricated base plate 1, and by arranging a snap-fit ​​assembly, the support reinforcement 5 is connected to the first longitudinal reinforcement 2 without welding and binding, thereby facilitating the prefabrication production of the prefabricated base plate 1 and improving production efficiency.

[0036] As a preferred technical solution of this embodiment, the ends of the first longitudinal reinforcement 2 and the first transverse reinforcement 3 are both extended out of the prefabricated base plate 1. Specifically, the extended ends of the first longitudinal reinforcement 2 and the first transverse reinforcement 3 are used for cast-in-place concrete connection with other building structures during the subsequent assembly of the prefabricated base plate 1.

[0037] As a preferred technical solution of this embodiment, the end of the first transverse rib 3 is provided in a hook shape. Specifically, the end of the first transverse rib 3 is provided in a hook shape for seam connection between two adjacent laminated plates arranged at the same floor height, enhancing the strength of the seam and preventing the seam from cracking. In addition, in the case of close splicing of the laminated plates, the end of the first transverse rib 3 does not protrude from the side of the precast bottom plate 1 and is not provided with a hook shape.

[0038] As a preferred technical solution of this embodiment, the end of the prestressed steel bar 4 is arranged inside the precast bottom plate 1. Specifically, the prestressed steel bar 4 is mainly used to enhance the rigidity of the laminated plate where it is located and prevent it from cracking. Therefore, it is avoided to protrude from the laminated plate and connect with other building structures, which may affect its performance.

[0039] As a preferred technical solution of this embodiment, the clamping assembly includes two opposite fork-shaped ribs 8 arranged on the support rib 5. A push plate 9 is movably arranged on the fork-shaped rib 8, and an elastic sheet 10 is connected between the two push plates 9. Specifically, the support rib 5 is preferably U-shaped with both ends facing downwards. The two fork-shaped ribs 8 are respectively connected to the two ends of the support rib 5 in the horizontal direction; the fork-shaped rib 8 is also preferably U-shaped with its end horizontal and facing away from the support rib 5. The distance between the two ends of the fork-shaped rib 8 matches the outer diameter of the first longitudinal rib 2; an opening matching the end of the fork-shaped rib 8 is formed on the push plate 9 and the push plate 9 is movably sleeved on the fork-shaped rib 8 through this opening. A "匚"-shaped connecting part is arranged on one side of the two push plates 9 close to each other, and the elastic sheet 10 is connected between the two connecting parts; the elastic sheet 10 is in an arc shape and is concave in the middle; when the elastic sheet 10 is not stressed, it keeps pushing the two push plates 9 away from each other. At this time, the maximum distance between the two push plates 9 is less than the distance between two adjacent first longitudinal ribs 2. In actual use, the support rib 5 drives the fork-shaped rib 8 to be inserted between two adjacent first longitudinal ribs 2 along the diagonal direction of the frame formed by the first longitudinal rib 2 and the first transverse rib 3, and then drives the fork-shaped rib 8 to return to the upright position perpendicular to the first longitudinal rib 2. At this time, the first longitudinal rib 2 is inserted into the fork-shaped rib 8 and pushes the push plate 9, causing the two push plates 9 to approach each other. Then, the two ends of the elastic sheet 10 approach and bend deeper to generate a reaction force, so that the push plate 9 is in close contact with the first longitudinal rib 2. Thus, the support rib 5 can be fixed on the two first longitudinal ribs 2 without welding or wire binding.

[0040] As the preferred technical scheme of this embodiment, a clamping seat 11 is provided on the support rib 5 in a liftable manner, and a clamping hole 12 matching the second longitudinal rib 6 is provided on the clamping seat 11. The lower end of the clamping seat 11 is connected to the middle of the elastic sheet 10 through a connecting piece 13. Specifically, the clamping seat 11 is preferably U-shaped, and the upper end of the support rib 5 is embedded in the clamping seat 11. The side of the clamping seat 11 is provided with guide plates sleeved on both ends of the support rib 5; under the condition that the elastic sheet 10 is not subjected to external force, the height of the clamping seat 11 is linked by the connecting piece 13, so that the clamping hole 12 is completely on the upper side of the support rib 5, which can facilitate the second longitudinal rib 6 to pass through the clamping hole 12; and when the fork rib 8 is vertically engaged with the first longitudinal rib 2 and the two push plates 9 are close to deepen the bending of the elastic sheet 10, the clamping seat 11 moves down a certain height with the middle part of the elastic sheet 10, thereby driving the clamping hole 12 down The second longitudinal rib 6 can be moved relative to the clamping hole 12, and the movement satisfies the horizontal rotation of the support rib 5 relative to the second longitudinal rib 6. Therefore, after the support rib 5 is first connected with the second longitudinal rib 6 by means of the clamping hole 12, the support rib 5 can be operated to be horizontally deflected to meet the installation requirements of the above-mentioned fork rib 8 while ensuring that the second longitudinal rib 6 is parallel to the first longitudinal rib 2. After each support rib 5 is engaged and connected with the first longitudinal rib 2, the elastic sheet 10 is bent deeper, and the clamping hole 12 can tighten the second longitudinal rib 6 downward. At this time, the second longitudinal rib 6 and the support rib 5 can be automatically limited and fixed.

[0041] As the preferred technical solution of this embodiment, the second transverse rib 7 is embedded in the base 11. Specifically, the second transverse rib 7 penetrates into the base 11 and is arranged on the upper end of the second longitudinal rib 6. Thus, a node among the support rib 5, the second longitudinal rib 6 and the second transverse rib 7 can be formed in the base 11. By performing welding operation at this node, the external grid structure can be stabilized, with fewer welding points and improved production efficiency.

[0042] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A novel prestressed crack-resistant composite plate, comprising a prefabricated bottom plate (1), wherein a plurality of first longitudinal ribs (2) and first transverse ribs (3) are evenly arranged in the prefabricated bottom plate (1), wherein the first longitudinal ribs (2) and the first transverse ribs (3) are perpendicular to each other, and characterized in that: Also includes: Prestressed steel bars (4) are evenly arranged in the prefabricated bottom plate (1) and are arranged parallel to the first longitudinal bars (2); An external grid is connected to the upper end of the prefabricated bottom plate (1), and comprises a plurality of support ribs (5) anchored to the prefabricated bottom plate (1), wherein the plurality of support ribs (5) are longitudinally distributed in a plurality of rows and the upper ends are connected to second longitudinal ribs (6), and the plurality of support ribs (5) are transversely distributed in a plurality of rows and the upper ends are connected to second transverse ribs (7); The support rib (5) is connected between two adjacent first longitudinal ribs (2) by means of a snap-fit ​​assembly without welding or binding.

2. The novel prestressed crack-resistant composite plate according to claim 1 is characterized in that: The ends of the first longitudinal rib (2) and the first transverse rib (3) are both arranged to extend out of the prefabricated bottom plate (1).

3. The novel prestressed crack-resistant composite plate according to claim 1 is characterized in that: The end of the first transverse rib (3) is arranged in a hook shape.

4. The novel prestressed crack-resistant composite plate according to claim 1 is characterized in that: The ends of the prestressed steel bars (4) are arranged inside the prefabricated bottom plate (1).

5. The novel prestressed crack-resistant composite plate according to claim 1 is characterized in that: The clamping assembly comprises two opposite fork ribs (8) arranged on the support rib (5), a push piece (9) is movably arranged on the fork rib (8), and an elastic piece (10) is connected between the two push pieces (9).

6. The novel prestressed crack-resistant composite plate according to claim 5 is characterized in that: A clamping seat (11) is provided on the support rib (5) in a liftable manner, and a clamping hole (12) matching the second longitudinal rib (6) is provided on the clamping seat (11). The lower end of the clamping seat (11) is connected to the middle of the elastic sheet (10) through a connecting piece (13).

7. The novel prestressed crack-resistant composite plate according to claim 6 is characterized in that: The inner diameter of the clamping hole (12) is larger than the outer diameter of the second longitudinal rib (6).

8. The novel prestressed crack-resistant composite plate according to claim 6 is characterized in that: The second transverse rib (7) is embedded in the holder (11).

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